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"I suppose I'm curious because I don't like them and they seem antiquated. And the idea of one button for both Lock and Unlock seemingly requires the user to know what the current state of the locks are before pressing the button"
My Z4 is the only BMW I've ever owned, so not sure if they all operate like mine, but you do kinda need to know the "current state" of your locks. I find myself glancing at the "pull" to see if the door is locked or unlocked at times. The key will unlock just the driver door with one push, and both doors with two pushes. If you only unlock the driver door, then after you are in and push the central lock/unlock button, it locks the driver door and leaves the passenger door locked........... there is some logic built into the system. I want to program mine to "auto lock" both doors (or the drivers if that is all I unlocked with the key) when you drive off and hit a certain speed. Nice feature in case you forget to lock your doors.
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