I mean, there are third-party review websites where you plug in shows you've watched and it recommends new ones, even showing you on which services they're available.

I just doubt people actually care so much that they use them. It's a minor nice-to-have feature. But the law of triviality will suggest that everyone will argue about it every time Netflix comes up, and we do, even though I doubt we really care.

I don't think it's any more useful than searching "best $genre $year" when you're looking for new things to watch.