Life steal vs spell vamp

Is it fair that a melee/range champ like Vayne can heal from 0 to full in 3-4 shots while spellvamp is barely registered in the damage/healing? Time to tone down the amount of heals a champ can get? Example: Morgana roots Vayne in the aoe, something that would normally kill an adc But Vayne uses her life steal and is actually HEALING for more than the damage is. and thats with a 600 ability point Morgana damage.... Really?
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