Spellvamp needs to be addressed.
For years now, spellvamp's been a problematic stat. Either it's been neigh useless, present only on weak items and barely seen ever, or it's overpowered on champions like Akali and Vladimir.
Why?
Lets not answer that, and instead ask what the world would be like if AP worked like spellvamp does. Where every single single target ability, like Disintegrate and Transfusion, had 1.0 AP ratios and every single AOE ability had .33. The problem with that becomes apparent immediately. Single target burst champions become overpowered, and AOE champions for the most part struggle to do anything in comparison. In order to keep the single target burst champions from ruining the game as a whole, AP would need to be kept weak to a point where every AP champion who wasn't primarily a single target oriented caster was neigh useless.
This is circumvented by giving abilities AP ratios. With AP ratios, you can give transfusion a .6 AP ratio, bouncing bomb a .65, mark of the assassin .9, crescent strike a .7, and if any AP champion is too good with AP, you can nerf their AP ratios.
You should very easily be capable of doing the same with spellvamp. Give every ability a spellvamp ratio, and get rid of the notion of AOE abilities simply getting one third the amount of spellvamp. Then, release new, good spellvamp items. And if a champion like Vladimir or Akali or Udyr or what have you uses it too well, nerf that champion's spellvamp ratios. Yes I mentioned Udyr. Yes this would allow AD spellvamp items.
This is a basic change, and it's long since overdue.
as there is really no room for it when you are basically required to use some combination of
.