Couldn't agree more. We are still basically the same shape and have the same physical properties that those who "invented" whichever style we might study possessed. H2H itself doesn't change, just our perception of it.
Gun techniques? These are indicative of "modern" systems, but like knife disarms, are not something i'd really like to have to try in actual combat. Try knife disarms with your opponent holding a magic marker, and you wearing a white shirt....it brings home the reality of playing with knives real quick.
Kaith's paintball disarm sounds like it'd do the same for playing with guns.
[Before anyone jumps up and down telling me that disarms are feasible - i agree, they are. They're just REALLY hard, and i wouldn't like to bet on them.]
Cheers
Baoquan.