> which is the same thing, but with a bigger library and shittier UI.
That's really not true at all. They are only now adding some of the feature set. Anecdotally, their radio stations are not nearly as good. Sometimes in a list of 15 songs, 12 of them might be from the same artist. If YTM does, in fact, have a bigger library, I could not tell.
Additionally, now my music suggestions are polluted by my video watching and my video watching is polluted by music listening. Neither of those things are desirable.
I'll be keeping the service, since I'm grandfathered in to YouTube Premium. But I'm probably going to switch to Spotify for music after using GPM since it came out.