Why did Riot get rid of spell vamp but not life steal?

I think its time to bring some spell vamp items to even out the playing field for mages. Swain is practically useless without some bonus spell vamp and vlad is just a sad vlad without it. AD champions are rewarded by building lifesteal with their primary stats being attached to it be it ad or attack speed. Either give all mages innate spell vamp or give us an item that can help us sustain in lane like any ad champ has access to.
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