Why though? It's not like real wounds are dealt with HP damage. HP is something that you can recover with at most some bandaids/ointments.
Of course you can, because it's exactly what happens in most media of the genre. You will fail at understanding hit points until you understand what HP simulates.
Amy strikes Bob for 5 HP of damage with her longsword.
Carl casts Healing Word and Bob regains 3 HP.
You can't "realistically" narrate this exchange even knowing the starting HP because HP don't actually MEAN anything, despite the insistence that this very gamist thing TOTALLY means meat. A HP is a HP is a HP. If you're describing them as life ending wounds, even at low HP, then that's your own fault. You don't get over a gut stab in an hour with some bandaids, or overnight. Your self-imposed lack of suspension of disbelief isn't a warlord design problem when you willingly buy into the other forms of HP stupidity.
Look, it the concept is that stupid to you, why are you even playing the game, since it's really the core of it ?
As for me, I absolutely stand by what Gygax wrote so long ago in the 1e DMG, which makes it really clear: "Damage scored to characters or certain monsters is actually not substantially physical — a mere nick or scratch until the last handful of hit points are considered — it is a matter of wearing away the endurance, the luck, the magical protections."
The beauty of the hit points is that they are FLEXIBLE and that they allow you to do the narration that you want depending on who receives what type of hit point damage at what part of the fight. Of course the orc receiving 12 points of damage will be gutted and dead instantly. Just as the 20th level fighter with 150 hp receiving 12 points of damage will probably just have a scratch, if that. Unless it's his last 12, in which case, again depending on the circumstances, it will be described certainly as life threatening, because, unattended, he has 50% chance to die.
And the same with the healing, the description is flexible.
D&D is trash at simulation.
No, it's not. It's trash at simulating the real world, but then it has never been the purpose.
It doesnt matter if Bob has 100 hp or 1. Why do the gods like 1HP Bob more? I mean, surely that 5 damage on a 1 HP guy is a total evisceration. Why can a potion of healing put a 4 HP guy's guts back in, and dont even fix a 100 HP guy's scratches? Why is the guy with his guts ripped out not suffering from trauma and shock?
Because it's fantasy and that's the way it works in books/movies of the genre. And if you don't like it, why are you even playing D&D ?
The only way HP work is through Schrodinger's Wounds, where they aren't anything until the critter actually dies.
They work through proper narration just like they do in all books/movies of the genre, but no author is stupid enough to create situations where people with dramatic life-threatening wounds recover when someone explicitly described as non-magical shouts at them. Because people find it silly, it breaks their suspension of disbelief.
Now, there is nothing wrong with playing D&D as purely gamist as you apparently do, but the system does actually fully support whatever narrative we want for those of us interested by it, as long as the system does not come to poke at us with things which look more silly than we can accept. I've not been the only one to say this, it's been a widespread criticism of the warlord, and I'm sorry, I'm not going to criticise your way of playing and your preferences, so please don't disparage ours either.