iOS does not display vertical-only apps correctly, when using the iPad as a laptop (iPad standing horizontally, keyboard attached). This makes it impractical to use the keyboard with many apps, as it's only practical to use the keyboard when the iPad is positioned horizontally.
Specifically: Vertical-only apps appear sideways using the iPad as a laptop. Expected behavior is for vertical-only apps to appear right-side-up, but with black bars on the side of the screen, so that the apps are still vertical while the iPad is standing horizontally (like black bars on a square-screen TV when watching a widescreen movie).
This severely limits the iPad's usefulness as a laptop, but it gets worse: I asked Apple support how to have my iPad use black bars, so that I could use my iPad as a laptop with vertical-only apps. They said that that's not possible, and that I should complain to the app developers. That the operating system can't control how apps are displayed.
That's absurd. Ture, it'd be nice for all apps to have both horizontal and vertical orientation support. But the lack of black bars is an iOS problem, not an app problem, and blaming app developers for that is not appropriate behavior! It disrespects me by insulting my intelligence. It disrespects the app developers. And lastly, it disrespects the programmers of iOS by implying that they're not competent enough to fix this problem.