You are kind of trying to say the weight class thing a bit backwards. To make the fight more evenly matched they Match weight. If weight wasn't a factor they wouldn't do it. But it is. In general martial artists understand this. So not really a martial arts argument across the board. FightingArts.com - Strength Training Benefits for Martial Artists: An Interview with Charles Staley Part 1 There are many martial arts who advocate strength training. You said yourself that it is harder with bigger guys. They have the advantage. Not at all sure how that is complicated.