So in Judo and Bjj for example one person doesn't allow another to do the techniques on them without any resistance ?
'ready to change' has nothing to do with anything..
How is the guy in Judo or Chinese wrestling being thrown not 'the fall guy'.
If they did certain things with their bodies differently (as your suggestions) the techniques would be impeded. How is it different.
different techniques would be stuffed in different ways!
this happens in all martial arts.
why are you even arguing the point, it's ridiculous Wayne.
How about Aikido - that also uses the grabbing arms method shown in that first clip a lot - his second shows more from strikes.
Karate
yes 'fall guys' are everywhere, it's training - in Boxing sometimes people just stand there with a guard, do one defence and LET the other practice a combo without impediment. Why can't they move out the way or parry deflect, cover up or whatever - or to strike back. no they ALLOW the other person to practice something without interference. They employ action(s) that are intended to allow techniques to be practiced unimpeded. sometimes one or two things are added to CHAIN techniques.
Same in wrestling - people will just 'stand there' in a crouched position and let another guy single leg them, no change in weight distribution. they could sprawl but they don't. they could do something else but they don't.
if you disagree, I don't know what planet you have been living on.
Of course also applies to all TCMA.
For the grabbing method to be useful to work (technique can be applied) force has to be fed a certain way. It doesn't really have anything to do with his balance or other factors. He's connected and stiff trying to hold the guy in place, not allowing him to move - we should all know how that works and how it allows so many techniques to work. There is a time and place for technique practice; in all martial arts. Different techniques require different actions from both parties. It's part of the learning process.
It's the common language across martial arts - for technique practice - it's you who is lacking a common understanding of this.