Thoughts on Instant Leech returning to the game?

Edit: Today I learned: Instant Leech obeys the size cap of a single leech instance introduced in 3.6. Meaning this is nothing like the instant leech of old and might be fine for the game. Source

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Yes, Bloodseeker exists, I know. But now Instant Leech returns as a mechanic accessible to any build via the new claw and life masteries. I remember the days with instant leech on Vaal Pact and it was removed from the game for a good reason in my opinion, so seeing the mechanic return makes me feel uneasy.

I also dont think its a numbers issue, "only" 10% of leech being instant is irrelevant to builds dealing a lot of damage. Most build have roughly the same life pool so any number for this stat makes it either completely useless for the majority of builds or absolutely busted for the top end builds.

I am curious to hear some thoughts on the issue.