Can't some people simply grab full screen snapshots of non-native games or other apps and post them? Just press power button + home and hold both to get a snapshot in the Gallery.
I have the 12.9" iPad Pro and have for almost a year now. The difference between optimized and non-optimized apps is barely noticeable unless you're really looking for it. Non-optimized apps look fine to me, however, based on the demanding tone of your comments (sorry we can't all stop what we're doing and take multiple screen shots for you) I'm thinking minor things may bother you.