Ah I see. Then again, others miss double tap to zoom in Safari and other apps though is that a problem of learning iOS or of iOS and its learning curve. Forgot the name of opposite of pinch, that gesture is also natural and others might try it. Seems to not conflict unless it was planned for something else. My preference is use the common zoom gestures and no preference since in fear of eventually having too many. Perhaps there is a variation in what is considered good iOS design. I side with me, but your choice.
