Theory of No HP.

        In the games I have played there seems to be about a 50% hit chance baseline. With the inevitable mix/maxing and optimization the hit goes up to ridiculous percentiles of 80-95%, do they have laser guided fists? Abstractly quantified health pools create that awkward scene of justifying why this guy is still standing despite all the damage he takes. Some games have successfully justified it with smaller hp pools.

        In HP driven games a miss tends to feel like a turn wasted, heaven forbid you miss any extra actions.

        This, for me, is compounded the hit percentiles. One of the top punchers currently alive crested at 46% accuracy, second place coming in at 38%. Though any connection percentile in a fight sport is skewed high by punching for points. Let me just pop this guy on the head a few times and make it look good before the bell, does not translate well into fighting for your life.

        A system functioning without HP creates, for me, a more realistic feel. The lucky one hit knockouts are a rare and fun possibility. Missed strikes are common and create a the high action feel as players vie for position and chain together moves up improve percentile. Just imagine your favorite action scene in any movie, the near misses are where the action is at. Once a significant blow is landed the combat generally ends. 

        In the case of hits without a KO, attack and defense roll disparity help paint a picture of damage taken. Damage taken by a character becomes an advantage in the attackers rolls pushing him closer to reaching that knock out DC known as Vitality.