This is changing quickly.

U2’s latest music will be stored in the Secure Enclave to ensure it cannot be deleted.

What do you use for the export process?

HomePods recognize your voice and switch accounts on the fly.

There is an option in Settings to use the music history played on this device (whether phone, iPad, or AppleTV) which sounds like the kind of toggle you are looking for. The setting is on by default but you can turn it off temporarily when playing something you don’t want influencing your algorithm.

It is…. strange. Does what it says on the tin.

Hope they include the back cover of the album artwork.