How irate would people be if a developer from Nairobi got their app update rejected because they couldn't find an Asian woman to pose for one of their screenshots for the App Store?
I agree that diversity is a good thing, but it's important to remember that not every developer can afford to hire models to show diversity that doesn't exist in their country.
Then we can have a screenshots as a service, where you send in a bunch of screen shots, and the SAAS returns a suitably diverse range of models holding devices with the screenshots showing.
It could even be generated with a neural network so that you don't need to find or pay models, and you can configure what physical disabilities they might have.
Doesn't this disadvantage smaller developers from countries less diverse than the United States?