Frozen Ever After felt like a filler ride. They repurposed Maelstrom for all intents and purposes. That is even more filler than TSMM. Thing is, Disney hasn't added enough rides to compare to UNI in the last decade (as Disneyhead stated). New Fantasyland had an underwhelming omnimover and a short, budget-reduced coaster. Let's not forget a Beauty & The Beast playset for children. Flight of Passage is a simulator, basically, and the River Journey is screen-based, although well done.
How else can you do Kong without screens? F&F has to be a screen-based ride, if you aren't going to use fast moving vehicles (such as a coaster). I think that Wizarding World and Diagon Alley shows that UNI has caught up with immersion. I have always felt that IOA as a whole was more immersive than anything at WDW (although Animal Kingdom comes close).
Also, I would imagine that this discussion has been hashed out and rehashed over on the screens forum.