I don't know why she doesn't work with Justin Tranter and Julia Michaels.. Aren't her and Justin friends? They did wonders for Britney. But if Adele can work with Max then Gaga should be able to also.
Why not? he's more respected/ talented than any one she's ever worked with..... (mark's debatable), he gets hits, radio will play a song produced by him, he brings out the best in people, etc.