Maybe I’m biased but when thinking about all the potential Potter additions to the park I think USH needs Hagrids more than Diagon Alley, Gringotts, Paris or MoM. I think Diagon Alley or Paris would be overkill in the same park. The last thing USH needs is more screen based rides. So Gringotts is out. From what I understand MoM is so grand and so unique that it sort of trancends being perceived as a stereotypical “screen ride.” But it has to go somewhere and that means Paris or Diagon Alley. Hagrids is the ideal way to add more Potter to the park if they are keen on doing so. It’s checks a few boxes for USH. Physical (non screen based), indoor/ outdoor family coaster attraction. It also would fill the role the Mummy currently plays for the park which I believe is not long for this world.
As much as I’d love a Classic monsters presence at USH I also think the Monsters ride and land at Epic U would be a bit redundant due to the similarities with FJ’s ride system and Wizarding Worlds aesthetic.