iTunes evolved into Apple Music because most people aren’t downloading MP3s or ripping their CDs anymore.
Apple Music’s streaming service is a separate offering that has grown larger than iTunes.
Google’s reputation is that they will have 2-3 services with the same functionality. Whereas there are pretty legitimate business reasons you want want to make a streaming business distinct from a legacy content purchasing business.
This is still an option. Likewise the playlists I created on the go on my iPod Nano in a 2008ish trip reliably got migrated from versions to versions up until now.