Title sort of explains itself. In the past, it's sometimes taken a while for certain apps to be updated for new screen sizes (6+, iPad Pro, etc). It mostly impacted smaller apps, but even apps like Facebook didn't see an update to the new screen sizes on the iPad Pro for a while.
Are devs going to have to go through this same process for the Xs Max?
Are devs going to have to go through this same process for the Xs Max?