Ehhhhhhhh, like most Google services and products, it's okay if you're the narrow focus user group that its designed around.

I, for one, don't want my YouTube likes and playlists all the same list as my music likes and playlists.

Google Play music felt cheaper, but was better almost all around. And Spotify, if you ignore them promoting ice and platforming and paying people like joe rogan and none of their musical artists and a bunch of other borderline evil things, actually had the best design and service.. I say had, because most of the service they really offer is the algorithm and databases, which a few years ago got really really shitty for some reason. Spotify has always flirted with having and not having incredible algorithms for suggesting music.. for whatever reason, 2016 was peak, and it's had some pretty radical falls since then, to now, where it's the most intelligence-insultingly bad algo I've ever seen, besides YouTube proper.