Spellvamp removed, OK, but why AP champions have access to absolutelyNO form of HP sustain?
- extremely, extremely weak. If you buy this for sustain you are doing it wrong.
- some outliers can use it, but that's it.
Meanwhile AD:
- that basically is spellvamp, but AD only?
- same story
- HP sustain even on starter items
Warlord bloodlust - up to more than 700 gold worth of stats on a mastery
and others - infinite, manaless, possibly ranged sustain
I get, spellvamp was too hard to balance, but a mastery, an elixir, some neutral buff, anything? Numbers on Eternity are awfully close to 0. Having to base 10 times as much as your enemy just because you happen to be shorter range mage is not a good gameplay experience. Maybe at least HP regen item.
Yeah, artilerries probably don't need it, but they have been nerfed to hell, and also Riot can easily make item, buff, whatever not accessible to the by giving it some important, short range property, they have the technology. And if Vlad breaks it, well maybe he should get a proper rework, not some excuse that leaves him with same problems only a bit more counterplay.
Because right now AP itemization is so insanely weak compared to AD, that the only option for Riot to make a viable AP champion is giving them some crazy mechanic like passive Kayle ult 
And no,
didn't fix anything, because of constant whining it got realeased in state so weak that even Annies don't bother to build it.

? Oh for f*ck's sake.

and
being two not-so-long-ago examples).