Don’t get me wrong, I use Beets for my entire library, but it doesn’t solve any of the issue OP has. It does not get metadata from streaming sites or anywhere else, but same as Picard from Musibrainz. It does not allow to manually change metadata of music you are importing. On the contrary, for that Picard is the better tool as it allows that.
There are not many advantages of using Beets over Picard, apart from CLI, and especially for the OP use case.
I would say it varies. In most episodes sure, but from O’Brien’s “He was more than a hero; he was a union man.” to the previous episode of Lower Decks, where the crew helped people abolish capitalism, and it was celebrated like a party. So I would say that it is a bit more leftist than you give it credit for.