I agree completely. I want a game where Eowyn and Merry can slay the Witch King of Angmar with a couple of fateful blows, where Legolas can slay a fell beast with a single arrow, where Bard can slay Smaug with a single arrow, where a samurai can slay just about anyone with a single stroke, etc., but where none of those things are guaranteed.I don't at all mind the idea of a 1-10 or 1-15 game design; and while I like the idea of a 10th being much more powerful than a 1st I also want to see a system where a lucky 1st *can* seriously threaten a 10th. My example here is and always has been Merry, Eohyl, and the Ringwraith: you've got a somewhat-experienced Fighter and a nobody bringing down one of the most feared and powerful foes in the world. Any game of mine absolutely has to allow for this to happen, somehow.
Hit point are (unintentionally) designed to prevent this. With hit points, characters either have few, so one attack can kill them, and two attacks will kill them, or they can have many, so one attack cannot kill them, but multiple attacks can. So we add on special rules for sneak attacks, magic weapons, etc. that keep damage escalating with hit points.