not-so-newguy
I'm the Straw Man in your argument
If you go by the rpg-lit book "critical failures," then magical healing is nearly orgasmic.
Not in 5E, no. As far as 5E is concerned, it is literally impossible for anyone under any circumstances to ever suffer such a degree of injury that it cannot be completely remedied through natural healing over a course of eight hours sleeping. If we dismiss the assertion that everyone in the world has a Wolverine-style healing factor, the only alternative is to accept that real damage just never occurs. (Short of death, of course, which is the only damage that can't be healed overnight.) (Or extreme exhaustion which, while falling short of death, can potentially take longer to recover from than any amount of HP damage.)HP are a abstraction, sure - but doesn't physical damage occur at some point? Especially at really low HP or 0?