The actual content of the films you're listing, films like The Marvels, is very neutral and apolitical. That's why almost all of the criticism focuses on vague generalities with almost no reference to the actual filmic text.
What Disney's push for inclusion demonstrates is something any observer of American history should understand - any move towards expanded inclusivity, no matter how mild and gradual, is likely to be met with frantic, vitriolic resistance, especially in a moment like the one the country is currently experiencing. Remember, you're talking about a film franchise that includes THIRTY-TWO FILMS and has THREE that star female protagonists and THREE others that feature non-white protagonists. It would be hard to imagine more gradual change. No one's busting down any doors.
Letting "change happen at its own pace" is almost always a great way to ensure no change takes place. Disney is demonstrating change in the way most say they want to see it - its a private company pushing for inclusivity based on its perception of changing markets and producing content in which that diversity is organic to the stories and not forced or didactic. At some point, the position (not saying this is yours) "I don't mind more diversity in art, just so long as no one intentionally increases diversity in art," becomes absurd.