Had this conversation with someone who chose to no longer be at my table after meeting a blind NPC
Another player who was at the table during the incident sent me this meme after the problem player in question (they had a history) left the group chat.
Felt like sharing it here because I'm sure more people should keep this kind of thing in mind.
I like to imagine healing magic as almost a targeted time reversal. Otherwise, things get would get strange when people are overhealed.
My head cannon is also that repeated magical healing increases the risk of cancers and defects when it is shown as a form of natural regrowth. It's totally worth using in combat if the alternative is death, but you risk shortening your life with repeated use. This helps explain people having sick battle scars and other wounds in most fantasy settings.
The other explanation that would make sense is that healers are exceptionally rare, but since we are heroes in these stories/games, it just doesn't seem like it to us.
I think you might like some of the lesser known systems. Your perspective would fit in(or at least it would have a place in) well with systems that represent a world setting that is a little darker brutal savage or just more open.
Burning Wheel, GURPS, Savage World and just about any World of Darkness version/flavour
Plus there's the idea of error stacking (basically cancers) every time healing takes place of reviving someone there's a little bit of error. And over time those errors start stacking on top of each other.
I feel like that opens up the opportunity to say they experience rapid aging in that area as well, accelerating cell divisions, right next to areas running at normal speed. Probably wouldn't be great for the circulatory system.