Rel
Liquid Awesome
Many games make do with a sort of HP that only represents physical injury.
Agreed. But it looks to me like D&D isn't one of them.
I just checked through 5 editions of D&D (Basic, 1e, 3e, 3.5 and 4e. I don't own 2e.) and only Basic referenced Hit Points as purely physical damage. All other editions indicated that there are other components including some combination of "combat skill, luck, magical forces, the ability to turn a deadly blow into a lesser one, divine favor and resolve".
When I think of D&D combat, I think abstraction. We know that you don't have to envision a PC only swinging his weapon one time in a 6 second round. We know that you don't have to envision a PC taking 6 direct hits from a greatsword before falling. If I'm abstracting anyway, I don't have a problem folding confidence and morale into what Hit Points are supposed to represent.