I'm thankful that YouTube music saved all my purchased and uploaded music from the Play Music days but it's really not built for playing your own music. 10 seconds of loading time to play music that is downloaded on my phone is frustrating. On the streaming side, it's really not built for free users. You can't close your phone screen or leave the app while music is playing or it'll stop. I don't care about ads so I'd prefer they just play an extra ad to give me that functionality.