So I was in class the other day doing kicking drills. I do a front push kick to my opponents groin/ stomach area. He downward parries my foot as it comes in.
Two major points of contention. 1) A push kick is a defensive move. It can be very effective however if it is done with full authority, which I doubt you did because it was class and you had no intention of hurting your training partner.
2) Your partner is trained and is excepting these types of actions. In the street, given that the other guy has no clue to what your capable of and whatever you do will be done with hopefully full power, your success ratio is very high.
I have watched a number of UFC, K-1 and such, with fully hard core trained fighters, get stopped with kicks to the arms (breaking the forearm), to the lower thigh - above the knee, forcing the fighter to go to the ground and unable to continue. Groin shots also - by accident, force a time out in the fight. These guys are waring protection and it still stops them.
Doing any technique half way or restricted invites failure and with it doubts. Go do the same drills with full padding and really go for the full technique and see what happens, even with a trained partner. You may be pleasently surprised.
Training is only as good as the fighter makes it and the fighter is only as good as the training he uses. Kind of a catch 22............