I do think Disney has lost sight of their parks as sources of original IP. The main funnel these days is film-to-park, and they feed the top of that funnel with new film-first IP (though even that is sparse given sequel and remake-mania). You have the occasional park-to-film (Pirates, Haunted Mansion, Jungle Cruise) but they aren't feeding that funnel at the top with new park-first IP
Whatever direction you go though, it makes too much business sense to not cross-pollinate IP across your touchpoint with customers. And even more important than that, the average park guest loves and expects it now
I don't see exploration as the unifying vision for Animal Kingdom. If a ride through the Pride Lands doesn't count as exploration because we already saw it in the movies (which I don't think is fair), then Na'vi River Journey fails too. The ride has no plot, so there's nothing we're exploring narratively, and the physical exploration isn't new by that same logic because we've already seen the jungles of Pandora in all its bioluminescent glory in the Avatar films.
I also don't buy it when there are more obvious unifying visions for the park, like "animals." Pandora is fine because, in its case, it did not retell a story that had little to do with animals. They instead designed attractions to highlight its fauna. Lion King's original story, being about animals, has a much stronger starting position as far as connection to the park