Dunno if anyone shared this upthread, but this is relevant:
"Hit points are a combination of actual physical constitution, skill at the avoidance of taking real physical damage, luck and/or magical or divine factors. Ten points of damage dealt to a rhino indicates a considerable wound, while the same damage sustained by the 8th-level fighter indicates a near-miss, a slight wound, and a bit of luck used up, a bit of fatigue piling up against his or her skill at avoiding the fatal cut or thrust. So even when a hit is scored in melee combat, it is more often than not a grazing blow, a mere light wound which would have been fatal (or nearly so) to a lesser mortal. If sufficient numbers of such wounds accrue to the character, however, stamina, skill, and luck will eventually run out, and an attack will strike home..."
From Gary Gyax's article Much about melee published in Dragon #24 (April, 1979).