Yea, as someone who listens to Nightcore/Japanese music, Youtube Music is by far the easiest way to listen and discover music. And the download offline feature has always worked great for me, a 100 songs uploads periodically to match what I've been listening to, so I don't run into the classic issue of using the same "I don't have service" music playlist.
Not that I don't get why people complain about the move (it is a dramatically different app), but Google is the only one with the actual usage numbers, and honestly I've never met someone who has used it. I'm guessing they weren't the best, while Youtube has some of the best usage numbers of any Western service.