Even though it should be - and, given the amount of discussion that arises every time the subject is broached, clearly is.
One can get a fair amount of the way there by modifying any of 0e-1e-2e such that armour gives damage reduction and h.p. don't increase with level anywhere near as fast as RAW would have them.
They're partly meat points (for various reasons including poison they have to be), and that you can still fully function at 1 h.p. having lost 76 h.p. is and always has been a glaring hole in the rules.
No, I'll just kitbash D&D.
Falling damage has always been another glaring hole in the rules, though it's much more easily solved than some others.
Some of that stems from a simple desire to narrate a hit differently from a miss. Otherwise you end up with:
Miss: "The blow glances off your shield for no damage."
Hit: "The blow glances off your shield for 7 damage."
And it's entirely possible the very use of the word "damage" might be at fault, as damage is usually defined as (and most certainly implies) something being physically harmed or broken or even destroyed.