Give developers time to update apps for iPhone Duo

Apple makes it sound easy to update apps for the new iPhone Duo. It's going to take some developers longer, not everything will work well at first, and some won't do it at all.
This is what you paid $2,000 for? Give it time: developers can have a lot to do to make their apps take proper advantage of the iPhone Duo - image elements credit: Apple.
Even though everyone believed a foldable iPhone was coming, Apple did manage to keep the iPhone Duo secret better than usual. Which means that as well a