[awesomerobot]

If I had an application that advertised to me like that I'd just uninstall it immediately, like I do on my phone.

I think a lot of people in this thread are getting so riled up about bad design the only alternative they see is totalitarianism.

In this case I think if you're giving an application your focus it should be able to use a secondary screen however the user wants it to. If the experience is bad people won't use your app.

Apple is instead saying "we know what all the good experiences are, so don't go having any bright ideas" — hopefully they won't strongly enforce any of their "guidelines"