I'm also realizing YouTube Music is terrible for building playlists compared to Google Play Music. And this odd "integration" with YouTube videos of music is frustrating and confusing. Just give me music. I don't want crappy versions of songs that have been uploaded to YouTube.
Cheers. Just happy you're actually aware of this and working in it. While you're at it, you might want a better icon. The current one fits really poorly with Material Design. Adding more thickness to the ring around the play button would certainly help