DND_Reborn
The High Aldwin
I think I have heard some argue they want advancing hit points to actually reflect someone able to take horrible wounds and resist dying with supernatural will force and keep on kicking so there is that... I just wonder why anyone would want that and object to overnight recovery.
Well, I can't speak for others, but my objection to overnight recovery is it takes a lot of the risk out of the game. 5E is super easy IMO. Once you get to level 3-5 or so, character death is pretty rare compared to 1E/2E. Since HD continue all the way to level 20, characters can have huge pools of HP. In our current party, we have two warrior-types with over 100 hp at level 10. Our DM has to be really brutal to beat down that many HP in one battle! Those characters, other than really dumb play or luck, will probably never die.
So, regardless of how you think of HP, I don't like the rest mechanic in 5E with overnight recovery.
Now, more to your point, not having overnight recovery makes a more gritty and realistic game if you think of HP as a lot of physical injury (even an accumulation of minor wounds). IME, people who want to play that way also want the realism of longer recovery because HP represents your body--and wounds take time to heal. They don't do it overnight.