But that's up to the particular player. Sit around and regen, camp, or soldier on.
Maybe if the rate of regen was tied to CON it would be more interesting? Hearty "tanky" types with a high CON would regen faster than back liners? Admittedly, I'm not sure how PoE currently works...if you drop during a fight you are KO'd, right? Then when the fight is over you wake up from the KO but have an "injury"? What if "injuries" can only be removed by proper rest and not regenerated from? Something like that? I'm just spitballing here.