In case you're wondering, here is the history. Originally, the mechanical switch affected only the rotation lock and the mute was a software switch elsewhere. In IOS-3, it was changed to be the mute switch and the rotation lock became a software switch. This was done to ensure consistency among IOS devices. Unfortunately, a large quantity of users complained loudly, alleging that they turned the rotation lock on and off several times every hour and the convenience of the mechanical switch is essential. In IOS-4, Apple bowed to the whiners and made the switch function selectable and now we're stuck with a mess.
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