EzekielRaiden
Follower of the Way
That is precisely what makes HP grow to such ridiculous amounts.I don't like the constitution score at first level.
But just having max hit die per level + constitution modifier seems solid.
By eliminating the +CON to HP per level, but giving the whole score at first level, you make 1st level characters more robust, but higher level characters less robust. Which, y'know, is an actual issue real people have with 5e, that levels 1 and 2 (or even 3 and 4!) are ridiculously fragile, while allegedly it's "impossible" to kill higher level characters.
So long as the character has at least a +2 CON mod, they'll get more than their Constitution score after just level 8. So you're effectively still giving them that. It just doesn't kick in until endgame. Even for a character with merely +1, they'll still get an amount equal to their Constitution score by level 12.
Big chunk for early survival. Low scaling for smaller top end numbers. Oh, and because death saves DON'T reset when you stand back up, 4e hard averted the "whack a mole" healing problem despite still having "healing starts from 0."
4e was, in many ways, more deadly than 5e at levels other than the first 1-4, where newbies are still learning the ropes.