I think it's a little much to assume kids like the park specifically because they prefer less-themed areas. Totally fair to say there are things about the park design and amenities that make kids/families enjoy it in spite of other issues. But do we really think if this thing looked like Isle of Berk, kids would like it less? Were there a bunch of children who never wanted to go into Fantasyland again after the 1983 redo?
Also, I've seen a bit of conflation between the sensory relief areas and the general lack of decoration. One is a very cool attempt by Universal to target an underserved audience. The other is... more complicated. Maybe I'm wrong, but I truly don't believe they held back set pieces from the Shrek ride out of respect for neurodivergent guests.
All that said, I think they've got the right idea with the stuff they've been adding to the Minions. Doesn't need to be "immersive" theming. Stylized decoration will do just fine. Excited to see what else they add, and I'm glad it's pulling crowds.