Simple, there are people with some physiological quirks who experience vertigo-like issues when seeing various movement, and it has been documented that in particular parallax and the new zooming animations in iOS 7 have caused those kinds of symptoms for some people. That is one of the main reasons why the movement setting was present from the beginning and one of the main reasons it was tweaked to apply to pretty much all movement/animations across the OS. Features like that are not there to allow people to customize things based on what's faster or cooler for them (even though they can be used for those purposes too to some degree)--they are primarily there for accessibility reasons which is essentially to assist someone with usability of something due to a limitation they might have or a condition they experience. That is why options of that nature (ones that modify the default behavior of the system for those kinds of purposes) are there in the accessibility section of settings and not elsewhere.Can you explain how any of those features is an "accessibility reason"? None of those effects (parallax, zoom, animated weather) are "needed" or not needed by anyone. They are simple user experience effects. And as such they should be optional for which ones a particular user wants or not. Sure none of them HAVE to even exist as they bring no real function other than user experience. Not sure I follow you on how 3D effect on home screen, zooming icons or rain coming down in the weather app is only for accessibility reasons.