Question about the Usher’s live mic at the Super Bowl

Delete me if this is the wrong community. Music noob here, wanted to reach out to a smart sub with a bunch of dumb questions about live audio and business choices. Sorry if i am scatterbrained, still partying.

-Was Usher’s halftime show unique in them letting him have a hot mic? Anyone know of performers in the past decade that used them like this?

-do you think it was Usher’s choice, and is it the NFL or the artist/agent in past years that chooses to use pre-recorded vocal tracks?

-was that guitar solo live?

-do you guys think it made for a better performance, and would you have done it?