1. I dont know, do they? Boxing is something you can see and validate very easily. These apparently super tough karate matches are much harder to find good examples of. Plenty of point fighting, i hope that's not what you're referring to. How long do they go for? how many rounds, are there rounds? How common are they for a karate practioner to have to endure? I'm not a karate expert nor do i pretend to be. The fact that one sport is different to another does not make it better or worse. In a professional boxing fight, or an amatuer one, you get a rest between rounds and you can have some water if you want. I dont see the problem.
2. you know the answer to this, and are asking a loaded question to try to prove an invalid point. The corner man gives advice. You fight. You dont have to take it. Plenty of fighters ignore the advice of their corner, not always to their benefit.
3. So what, you're only allowed to know things about a sport if you actively compete in that sport? You dont have to play soccer to know what the purpose of a goal keeper is. Since you're the paragon of what does and does not matter in boxing / mma, how's your professional boxing / mma record look? Probably much the same as mine. I could give you examples of actually receiving helpful corner advice in sparring / smokers, but i dont need to do i. Someone else has already given better examples from the world of professional boxing. If guys like that can benefit from advice during a fight, then of course chumps like me can too.
Ahheadlock