Why does Maw even have the lifesteal passive?

Like, the item is absurdly efficient already. The shield already makes it difficult for a burst champion to kill someone with maw, but adding sustain on top of that makes it nearly impossible unless you're extremely ahead.

They should just remove the Lifegrip passive from it entirely. The only reason it's there is because they wanted to preserve that passive from old Rageblade, but it's not necessary and the item would still be good without it.