They looked at the MIB ride and went "yeah....let's just do that. It fits Epcot then, right???" Which is funny because I feel like Mission BO in California was them looking at Transformers: The Ride and thinking they could do that with TOT. Whenever Disney tries to get into Universal's lane, it ends badly. We see it with the new Toontown going after Super Nintendo World, with Galaxy's Edge going after Wizarding World, and with these "ride the movies" style attractions they are coming out with now. They need to go back and look at the original Star Tours and IJA and see what made those work and understand it instead of just copy and pasting elements.The problem isn’t including fantastical elements. It’s that fantasy and magic should be used to frame educational experiences and inspire guests to learn more. Cosmic Rewind is almost an exact inversion of the standard pavilion paradigm. Education is the window dressing presented as factoids in the Galaxarium, and the fun happens when the education relents to allow you to consume more MCU media. The whole premise is basically that it’s a fake pavilion with a ride completely divorced from the philosophy of the park. It shouldn’t be the Wonders of Xandar. It should be the Wonders of the Galaxy presented by Xandar, and the ride itself should awe guests with imagery of the Big Bang rather than chase a giant space alien from the latest Marvel movie.
tl;dr: Fantasy can be the framing device, but education and real-world inspiration should be the point. Here, education is the framing device and fantasy is the point.