I'm not sure (see article) -- it would mean every app developer would have to test with it on and off to make sure that gesture didn't get in the way of their U

I'm not sure (see article) -- it would mean every app developer would have to test with it on and off to make sure that gesture didn't get in the way of their UI. It's also hard for users annoyed with the feature to discover. I suspect that particular gesture is a little awkward. Try it! Getting enough motion to reliably detect it as something different to a scroll or pinch is almost painful.