I’m not sure about this, we already support resizing on our app for a while now because of our iPad/mac catalyst version, so I fail to see how different it would be on the Duo.

I assume other apps will have have the same, since our team is super small compared to everyone else.

The small screen is so small they had to move controls to the right, I would expect glitches because of that, especially for custom controls.

Apps not rebuilt with the latest SDK will display in pillar-boxes mode, centred on the screen.