The problem is that you don't have to go full defense. People have a hard time finishing people who are literally afk.
When a fighter is hurt in real life, it's an important event. The defensive fighter scrambles to recollect themselves while their opponent tries to play a delicate game of trying to finish them, without leaving themselves too open or gassing themselves out. Neither side can make a mistake or it'll have devastating consequences.
It's usually a pivotal moment in a fight and an extremely dangerous situation to find yourself in as a fighter. Look no further than Jones wobbling DC.
Right now in the game, it's not at all dangerous. When you get rocked or flashed KD with the automatic standups, all it means is that you're likely down on the scorecards. It has no real consequences beyond that.
The devs really need to take away the take away the wolverine-esque healing and/or quadruple the duration of health events or at least add duration tiers depending on how damaging the shot was.
3 second health events makes them effectively useless.