The Tower certainly could have used some more varied visuals.

The white tower/cyberspace areas aren't 'bad' imo but having the first 3/4 of the raid be just that wasn't great.

They could have for example drawn from Nier Replicant visually for the Knave of Hearts and Hansel & Grettle encounters, and saved the cyberspace thing for the Red Girl boss who actually makes use of it by incorporating the hacking mini game stuff from Automata into the mechanics and boss arena.

The final boss arena is gorgeous but they could have done a lot by say, having us fight the Knave of Hearts in the Library from hte first Nier and Hansel and Grettle in the temple area thing they're fought in.