My opinion is that some peoples perception of what is evasion tends to differ. Boxers do not only consider bobbing or weaving evasions, but stepping, turning and swaying are evasions.
Not only does evasion understanding and practice differ from art to art , but from teacher to teacher. I have seen young students training in kickboxing (Eastern= Muay Thai, Lethwei, etc... and Western PKA, etc...) and when I put up a rope for slipping drills, the young ones jump under the rope, "I know this!" and they stand flat footed right under the rope only slipping the head repeatedly in a horsesheo shape. LOL. They think that is it, head slip only. Then when i show them to slip-n-step under the rope and tell them to move their whole body into a full body slip, They are confused and upset, "My Instructor never showed me this" as if that statement makes my principles moot, lol. they return to the slip, "See!?" feet flat neither moving forward, backward, or side to side, head slip, eyes dropping down, hands lower than shoulder level, no body movement. I ask "Show me how that works" they say "You jab, I slip head slip out, you cross, I head slip out, you hook I head slip out, you can't hit me", LMAO!
So I say "Show me that again", as if he was teaching me a lesson, He says "OK" "You jab I head slip out, you cross I head slip"- by then I have stepped in from the jab and dug into his body w/ hooks, uppercuts and what some call upset punches (upward angled body hook/uppercuts on an approx. 45 degrees into the ribs." Hey you can not do that!" LOL, "Yes I can!, Your opponent will not just stand flat footed as you are just throwing jab cross hook for you to look cool slipping. If I can not find your head in 1 or 2 shots and you have not full body slipped or stepped, I will kill the body because your belly button never moves", "But, But, But" he stammered, lol. His Instructor stood there shaking his head because his student could not see beyond the 1 aspect of a drill he was given. One slip does not all evasion make.
Yes i know the story is breaking my own arm patting myself on the back, lol, but it also shows how many can see only 1 simple aspect of potentially more complex evasions. In the ABA there is a 9 count stepping drill which teaches evasion stepping, step, turn, sway all techniques for removing your targets. A very good set of skills for beginners of any art. The ABA Blocking drill was then taught after the Stepping drill was absorbed well, then the skills were to be merged so to speak, step, block/deflect and then counter offense. Good sequence of blending skills.
I have seen many arts in commercial schools teach, Hi, side, Lo, block as intro then now you learn front punch reverse punch front kick side kick round kick hook kick back kick, inside cresent kick outside cresent kick, etc... and absolutly no evasion, or slipping or target removal what so ever, lol, my god my 1st Instructor is rolling over in his grave.
Many arts have their own techniques for some kind of evasion, an Aikido practioner will absolutely side step or slip a punch or kick in their own manner. Bagua practitions will evade in their own manner as well as will Tai Chi practioners etc...etc...etc...
Try not to judge another arts evasions for your systems prefered evasions, many ways to skin a cat, lol. I feel evasions are like mathmatical formulas, simple + simple + simple equals complex, this is just my analogy. If you only have 1 aspect of evasion, you are missing the rest of the world. Example- Mauy Boran & Bama Lethwei many many years ago never slipped and evaded the way they now do due to their introduction to western boxing evasion/slipping skills, now many MT practioners will slip , cross hook cross, slip hook cross hook etc..like never before seen in the ancient arts ways (Not saying MT etc... never slipped or evaded, just they never slipped like they do now like western boxers). Much to learn from many arts principles.
I just dislike an inexperienced youth in martial arts preach footwork and evasion, then all they do is either flat footed head slip or the TKD pogo jumping footwork (LOL) right in place neither advancing or retreating or side stepping and call it footwork when all they are doing is giving their opponent a steady rythum of "I am here, I am here, I am here", LOL.
Please forgive my self important opinions, but I am disappointed in these youth or half understanding instructors with less than a quarter of the playbook so to speak and feel they are full of knowledge, lol.
Now Blockiong is a different animal than evasion, it is all defensive skill sets as opposed to offensive skill sets like punching , kicking etc... In my opinion Blocking is not unlike a shield technique = force meets force head on. many hard syle systems profess, a block is a hit, a hit is a block. Stirke/Punish the hand or foot that dare attack you. This is common for many hard styles. Other defensive techniques are not quite as bull, boar or canine like, some are feline, like parrying and deflections. In some way similar to european fencing deflections, redirect energy rather than clash with it. These I find work very well along with sound evasions, like this formula of blended skills so to speak. Aikido and other soft or gentle arts tend to use these deflection w/ evasion and add a locking or throwing or repulsing counter, sometimes right into a wall or bar or floor, lol. LOVE IT. A good deflection typically (Not always) uses less effort or foce when apllied soundly.
I feel that evasion skills like steps, turns, etc... followed by sound blocking/shielding even deflection skills should be taught first off in most arts that are even defined as a strking art. Especially some commercial schools do not teach this way due to the fact that most families, children involved in some arts are bored or not interested by such skills and want to learn the helicopter kick or whatever jump kick is popular due to the kid martial arts movie (3Ninjas, Spy Kids, etc...)
EVASIONS & BLOCKING- LEARN IT, LIVE IT, LOVE IT!