i don't exactly know what the reasoning behind this is, didn't the old veteran mastery give like 50hp at level 1?
Anyway chrysalis is gone, resolve HP bonus is gone, there is no way to actually gain any significant early HP from runes other than this 15HP crap.
Let me put it this way:
Old runes could have given you +122 HP at level 1 (without including HP-quints, it's 200 bonus HP with the quints). We are looking at around 362HP at level 18 with scaling HP runes (quints included)
Season 8 runes gave you +65 / +80 HP at level 1 (depending on secondary rune path) +185 / +320 HP at level 18
Season 9 runes give you +15 HP at level 1 and +90 at level 18
Whats next?
Season 10 reduces your HP total by 50?
There is no reason to ever pick the HP with that 15 bonus HP you might survive another caster minion auto attack but thats it
And at level 18 it's a super minion auto attack, actually I think the super minion does more than 90
Edit: It's not even that, just look at the numbers
Let's say you are playing Olaf and you pick the 5 armor instead of +15 HP
At level 1 that will bump your armor from 35 to 40
The damage multiplier goes from 0.7407 to 0.7143
That is an increase of 3.7% effective HP
Olaf HP at level 1 is 600, that bumps his effective HP up by 22
The HP rune would have been worth 20 effective HP
Whats the point?