I'm honestly getting a bit disillusioned with Cast. I replaced all my Sonos with Nest speakers because of the better voice assistant functionality. "Fully supported" services like YouTube Music (that can be integrated as your default music service) work fine. But when I'm trying to use Plex or Tidal I run into issues if I try to include things like my Nest Hub in a group or dynamically add/remove speakers from what's playing.