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One potential workaround for this is to utilize the Smart Playlist feature on the Music/iTunes app on your Mac/PC. I have this set up for myself so when I get a new phone, it’s less cumbersome to re-download all my music back to my phone one by one.
To my knowledge at the moment, there’s no way to download all your music in one shot. But with a smart playlist, you can have Apple Music automatically add new songs you add to your library to a specific playlist and then download the entire playlist in one shot from Apple Music.
Using this method, you could theoretically delete all the downloads from your iPhone in the settings app and then download the playlist in one go from the music app, and any tracks that are available in the higher quality formats will be the ones downloaded.
And given that it’s a smart playlist, any time you add a song to your library, it will automatically be added to the playlist too. You don’t have to do a thing! Hopefully this helps!