I never claimed they can. But so far you can run an app in full screen mode and unless a special event happens, you won't get something on top of it. The audio

I never claimed they can. But so far you can run an app in full screen mode and unless a special event happens, you won't get something on top of it. The audio indicator is completely different, because as long there is audio recording in your system, you don't seem to be able to get rid of it. At no time. If nothing exceptional happens on your system, the OS should allow full-screen apps to run. So far, all OSes did so.