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My primary answer is pending on your situation.
Health is a good thing this isn't new - it benefits everyone. If you can live longer you can either do more damage or secure more objectives, support more etc. Health helps. Even on ADCs.
I don't think you'd want to rush it as your FIRST item though - as you said after grabbing some Cores first theeeeeen I'd say it's more viable. Or earlier on if you're in a massive lead, I'm talking SK putting down the Puppies massive lead.