The Apple TV's "TV app" is great for this... but for some reason, it only functions in the US. I get that it has a "live cable" Single-Sign-On component that cable providers need to sign up with–but all I want from it is the unified interface for searching/browsing and watch-tracking of content within streaming services!
I'd wager that's because (aside from Apple generally being US-based) international distribution rights are an even bigger minefield than US distribution rights.