I think this is my main hesitation with picking up the Duo on the first release. I have no doubt the build quality is exceptional, but the chance that the apps I use are not well optimized for this new form factor is pretty high in the first year of its release.
I don't think they won't work, but I anticipate oddities to appear for a while, especially for older applications.
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.