User blog comment:Berryeater/League of Rework, Part 2, attributes/@comment-27080952-20160526040527/@comment-26378838-20160526184950

I stand corrected on a technicality: it still exists as an ephemeral effect, but not as a stat you can buy from the shop. Shouldn't that tell you once again what Riot devs (and many on this blog post) think, that things like spell vamp and sustain based on abilities are only healthy when in niches, just like life steal does with basic attacks?

You just don't seem to think all the way through with your suggestions, and you're missing the point that life steal is consistent as it is but DD-like sustain replacing it simply wouldn't: it'd privilege spammy casters and leave marksmen like  or, who are very reliant on added effects to their basic attacks rather than doing pure physical damage, sitting  ducks due to lack of sustain. can build and go for a more hybrid kind of build, but  can't without pissing away precious gold on a stat that is useless to her since she lacks.

The same thing happened with spell vamp: champions like abused the hell out of it, while other  champions gained little sustain from it. That's why it was yanked out of itemization, it was simply too inconsistent for what it was intended for. Life steal doesn't suffer from this, it consistently works on all AA-based champions with pretty much the same effect, so why replace it just to reintroduce a problem that was on the other side of the scaling field?