There are probably a few ways to improve things. Cross-platform search should be standard by now. A shared watchlist across services would help.
Apple tried this with the TV app on their AppleTVs. It was supposed to pull all your subscriptions into one interface, searchable, with tracking and watchlists and all that good stuff. One unified app to all your content.
Then Netflix said they weren't going to play ball, so most others refused too, and now it works with only like 1/3 of streaming services out there.