It is really akward to try to block and punch at the same time. I do it in boxing but it has a limited use. I just cant see combinations coming fast enough to get the positions in time for them to make them work.
Head movement means I can punch with both hands where blocking and punching means I can only punch with one.
Now the sneaky trick with head movement is I can move to where they probably are not going to hit me. And that means I can be moving there before they attack. Rather than seeing a punch working out a defence then seeing the next punch and so on.
There is a whole bunch of really important things like timing and cardio and creating openings that a lot of martial arts do not spend enough time on. Believing that technique is worth more bang for buck.
You get this with the groin kick crowd a lot.
The correct technique for groin kicking probably. I dont know because it doesnt matter that much.
MMA groin kicks which I imagine were not trained and have no specific technique.
And my view is that I will have better results learning to set up any kick rather than train the perfect groin kick. In that I will out groin kick a groin kick specialist.
All of this means that the training they are doing in the top video is time wasting.(mostly)
And why sports fighters are good at fighting in months that take other systems years.