It depends on how author view about tsun. But personaly I think it definitely not about beating MC without any reason (if it not some kind of SM play). And agree that repeating the same scene/plot make tsun lost appeal.
Because the authors are masochist? I mean sure, girls with two sides are cute but if you want to add brass knuckles on one of the girls, i'll stick to the ye old crazy btch than a brutish chick who thinks that her fist are like cupid's arrows.
They do exist. Just from my personal experience and friends these people exist. One good example is that one kid in the first year of school who pulls a girls hair because he doesn’t know how to express his feelings. And guess what as the years go by many people still have trouble expressing their feeling to those they like. Tsundere are an interesting breed. I feel everyone has a little of that in all of us.
definitely da later~ well can't blame~ tsundere become more annoying trope than it used to be~ initially tsundere is character who first seem cold but as time passes and affection level grow they become really sweet type comparable to deredere type~ but now it more like grade school love type I guess~