Think it’s a result of focus on integrating more technology in rides because it’s a less demanding process in terms of engineering. Disney World’s most advanced coaster is probably Expedition Everest, which is fantastic, but opened in 2006 - and to be fair, probably isn’t much more exciting than Space Mountain, which is ancient. Whereas the newer attractions are things like Avatar Flight of Passage, which is basically a glorified arcade game where you get in a seat and the sensation comes from being in front of a giant screen.