There's nothing wrong with that boss. The adds are essentially just a bunch of untelegraphed exaflares, the type of AOE that people struggle the most with eyeballing. It was the same story during the Fall Guys collab. There were endless complaints about the bombs on the final stage, but they were incredibly fair once you understood how they move. Not once did I get hit by something I didn't deserve to get hit by, and it's no different in Strayborough.

I like that boss a lot. In general, this game has too much scripted dance choreography, and not enough randomness and improvisation. By that metric it's probably one of the best dungeon bosses in the game, and the level that every other boss should aspire to.