In browsing through my PHB as well, a thought occurred to me about Hit Points.
If hit points represent all these different things, I think CON bonus should be removed or another bonus such as WIS (
not CHA, thank you very much... it already has enough FGS) should be added as well. IIRC in another thread
@Garthanos mentioned this before as well.
The focus on adding CON bonus to HP fosters the issues about HP being physical. Compounded with feats like Toughness, for example, increases the idea that HP are meant to be physical.
I think allowing CON bonus to modify Death Saves (as we house-rule) still makes it pretty important, but it would also make it so CON is not an "we-always-want-a-bonus-here" ability score.
Now, as much as I hate to suggest it, I know most likely someone else would anyway, so I'll just bite the bullet and say it: What about "the will to live?" Could that be CHA? Maybe...? Maybe not. I could see an arguement either way.
Luck is in the roll of the Hit Die, so I am not concerned as much with that one.
Notice also, that no where in this description of HP is there skill, or a sixth-sense, or other concepts that are often lumped into HP. I would suppose you could think "physical durability" might also include the energy/ fatigue-element. And "mental durability" might actually be the skill or sixth-sense.
And why should a creature with few hit points (given this representation) be necessarily considered "more fragile"? Maybe they are just unlucky? Maybe they don't have as strong a will to live? The idea of fragile could be extended to mental ability and possibly being unbalanced, but why would that make someone easier to "kill"?
Again, if the word
kill was replaced with
defeat it wouldn't be as bad IMO. But even given the explanations I can offer new players, the wording is very misleading and presents a lot of HP as physical. I don't think WotC did such a good job in this respect.