Disney has never cared about who they work with so highlighting it was always a marketing ploy.
The people who work on those films are already a reflection of America like literally Encanto was created by two white guys, a Puerto Rican theater kid, and a bunch of Mexicans that they pulled together.
It didn't matter that the creators were white because the main thing that the story was about was a family which is something that everybody has in some way or form.
The reason all of these "diversity" efforts end up falling flat is simply because they write the character as their identity first, and any character writing comes second if it exists at all.
The moment the character becomes the "black character" and all of your script revolving around them is about what ethnic stereotype they're meant to embody you've already lost the plot and it's really no different than the stuff we used to see back in the 1930s.
Nobody says anything about cyborg from the teen Titans and he's been around for decades and the same can be said about Bugs Bunny cross-dressing.
Even the very liberal-minded Hamilton basically embody tropes and if you look deeper maybe the race can mean something but more often than not there's a reason it has conservative fans too.
This is basic characterizing 101
