Without ring outs and other secondary win conditions, there's no points to any rules other than "don't kill 'em too bad" which makes the story predictable. Having them be possible makes it so the story isn't just about two meatheads punching each other's dicks off with increasingly greater pseudo-science nonsense, but with two meatheads punching each other's dicks off with greater pseudo-science AND having to use their brain for more than just beating their opponents pseudo-science with their more intelligent pseudo-science... and actually use tactics and create their ideal combat scenario to win.
You guys are giving this move way more precedence than it demands. It was the only way for someone clearly outmatched (after the deus ex machina hand smashing montage made it one sided) to have a winning chance at victory. The name of the game isn't smash face, it's to win without cheating. This is season 2 of a almost-mystical but grounded battle manga, where there hasn't been any real secondary wins, or anything other than "Heh, nothin' personnel, kid" and unga-bunga Combo B. Combat (even professional fighting) is more than whose stronger, it's whose smarter, quicker thinking, and knows their surroundings. Retreating and defending can actually be an aggressive move, and not purely defensive.This is also a battle manga, where chapter ends are always cliffhangers, and this is a big fat one dangling whose the winner and the other fighters reactions over the reader's head—there's more to it.