First we need to understand that there is always someone who is stronger, or faster, or more skilled, or luckier but we need to not think about that at all because if you do, when confronted, you will lose because if nothing else the other guy was luckier because you were distracted.
Now Bagua and XIngyi
Basically I think you are looking at the Xingyiquan forms from the mile high view or as an unchangeable painting on the wall or something set in stone. The Wuxingquan progression is a training tool and not to be thought of as a real world application, although in the right circumstances it could be used as trained but that would be incredibly rare.
All the forms in Xingyiquan can evade, step off the line, and angle, they can all go backwards too. It is just when they do this, unlike Bagua that when it evades steps off the line, angles or avoids, it is evading, stepping off the line, anglings or avoiding. Xingyiquan when it evades steps off the line, angles or avoids is attacking, attacking, attacking, attacking, and attacking. That is where xingyi gets the reputation of not backing up because even when it does back upÂ…it attacks
I feel a mistake a lot make in training Xingyiquan is they first learn piquan, zuanquan, bengquan , paoquan, and hengquan individually and then they learn the linking form and never revisit piquan, zuanquan, bengquan , paoquan, and hengquan as separate forms. You need to work with all the five elements by themselves actually you will get more out of the elements if you do work with them individually. They do not always go straight, they do not always angle the same, they do not always go forward. You need to figure out how they angle, avoid, backup and when they do this how they stay Xingyiquan, meaning how they stay aggressive and attack (and if done right it is not slow and it can be JKD fast). Also another mistake I see is the adherence to the sequence in the linking form the start at piquan then zuanquan then bengquan then paoquan, and finish with hengquan and never EVER change it. You need to mix those up in order to be able to respond to what comes at you and “not” get stuck in the pattern because recognizable patterns will get you hurt in a fight, after one is really comfortable with the 5 elements linking form….change it work at training.
hengquan, zuanquan, piquan, bengquan, hengquan and paoquan or any other combination you come up with.
Another problem I see is people never work with piquan, zuanquan, bengquan , paoquan, and hengquan on a heavy bag. I have seen Novell Bell do this and I think part of what he is doing is good, you need to know how to apply the forms when you cannot move but another part is hitting a heavy bag while moving the form. If you can hit the bag, with power, and maintain good Xingyiquan structure you are not only finding where the power of Xingyiquan comes form but you are also “TRULY” testing your Santi Shi. Also stand in front of the bag at the proper distance, not in Santi but parallel to it and hit it using the fists piquan, zuanquan, bengquan , paoquan, and hengquan over and over again and DO NOT tie your breathing to it. DO NOT exhale when you strike, just breath normally, relax, find your root the connectivity and just stand there and hit the bag. And with this you do not move your feet, just your arms.
A lot, A WHOLE LOT, of Xingyiquan training is by yourself, repetitive dull and boring but the results, IMO, are very worth it, but it is not for everyone, it is not pretty to look at, it takes time to see resaults and the real training of it hurts... sometimes a lot.
Also although I have very limited training in the 12 or 10 animals (depending on style and lineage) all of the above need to be applied to the animal forms as well.
The saying is that after about 2 years of proper training in Xingyi you can defend yourself but that is still at a mingjen (beginner) level there is a lot more to learn after that and even though Xingyiquan looks very simplistic, donÂ’t let it fool you because it is not. There is a lot more going on internally in Xingyiquan that the external view of it would lead you to believe.
Another aspect you are missing, it is not all “your power” in a traditional looking Xingyiquan attack. You are moving forward towards the opponent, he is moving forward towards you. The idea, in that case with Piquan is he continues to move and you get to santi and all your momentum goes into the opponent and all the opponents momentum meets santi and your forward force has just been increased by the opponents force. Basically he ran head long into a truck that hit its brakes. The trucks energy will still transfer to the person that ran head long into it if they connect at the right time. But with Piquan, done right there is a trick. It is a downwards, forwards and slightly upwards strike…in that order. But that is high level stuff from my understanding and for most of us it is just downwards and forwards., However the other hand, the none striking hand, has its uses too, as do all non-striking hands in the forms. And in combination, in piquan, it can cause severe and protracted pain or worse so I will not go into any detail here.
As to Santi Shi, my opinion has changed a bit over the years. Yes I do think it is basic, yes I do think it is necessary and important to learn it and train it to understand XIngyi in application but I no longer feel it is necessary to stand in it for hours a day. To me it is better to get proper training it Santi, proper structure, and then move it against something heavy. If you can hit something, not fall over because you over committed or not fall backwards from the recoil and still move the heavy bag you are, IMO, gaining a much better understanding of Santi Shi than you will gain by standing in it for 20 minutes per side, per day for 20 years.
Should Xingyiquan be modified to fit a more modern approach, In that in real fighting traditional santi is disregarded and a more, Modern stance taken (krav maga, jkd, army combative)?
The answer is no. Train Xingyiquan properly with some of what I posted above, understand that it is not a quick fix or easy to learn. Except it will take a while, likely a lifetime and then train Xingyiquan don’t worry about the rest. There was a guy I saw a film of who teaches Xingyiquan in Beijing and I really liked what he said when he was correcting a student doing tuishou. “Xingyi is for fighting, it is not a dance” Sadly many train the dance and believe they are training for fighting, based on Xingyiquan reputation, and never realize they are just dancing.
If you want to fit a more modern approach and learn to fight really fast and not put in a whole lot of time then train krav maga, jkd, army combative, sanda. If you want to learn Xingyiquan then learn Xingyiquan and train it correctly. Also never forget, Xingyiquan was an army combative once, unlike Bagua or Taijiquan. But I will say I think it is easy to become too reliant on Santi Shi form a traditional POV and I think if one becomes to dependent on the static posture it will at some point, early in the training, cause problems with rooting and becoming double weighted. Santi is important but it needs to move and you need to learn how to move it. As for a more modern stance for fighting, train xingyi right and long enough and you will see it is already there, and the best example of that I have seen recently is in a video on Youtube done by Novell Bell working a heavy bag with Xingyiquan. But donÂ’t forget that xingyi ia aggressive and has no problem with first strikes (preventative strikes

) so you need to get from point A (where you are) to point B (where the other guy is) and if you do it right and move santi correctly with proper structure and alignment, and maintain it, you will hit him, fast, and hard and he will fall down and then you donÂ’t need the other stance. But in the event that does not happen or evades you need to understand how piquan, zuanquan, bengquan , paoquan, and hengquan work when you canÂ’t move too
Xingyiquan, more than most arts I have trained, loves to hit hard, fast and once and move on to the next guy if needed and it does that based on moving Santi properly. However that does not mean that it cannot stand there and duke it ouf if it needs too without Santi, because it can.