No app on your iPhone was designed to be used with a mouse.
The fact that a mouse can work on a touch os is not the point. The point is apps won’t continue to be developed solely for touch and the user experience for touch users will suffer because of it.
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Is seems to me that at the moment the iPad suffers much more from not having the option to use a pointing device in some cases were a touch input limits the productive usage. I dont think it is necessary to make a religion out of the touch input. They already added the keyboard which is spoiling the idea of the touch input at least as much as a mouse or trackpad. Also a keyboard without pointing device makes no sense to me....