[conradev]

While I completely agree that the default controls need to be intuitive, I am also of the opinion that these little hidden gestures, these shortcuts, are not necessarily bad. I agree with John Gruber when he says that:

"... gestures are to iOS what keyboard shortcuts are to Mac OS — an alternative way to do something as a convenience for advanced users." [1]

I understand that this gesture doesn't solve the problem of one-handed zooming for everyone, and that the solution will need to be more obvious to include everyone. It's just that a more obvious solution may add unnecessary clutter.

[1] http://daringfireball.net/2012/04/obviousness