Simple things that have become staples in the way mobile operating system behave - like having the keyboard case change when the shift key is pressed – are only now becoming relatively recent additions to the roster of usability enhancements (and that's only if enough people complain that it's something that's missing).

Want to increase the volume of the navigation voice quickly without looking away from the road? Best wait until it talks again so you tweak the right volume control (really? Enough foresight to have separate volumes for specific needs, but no way of changing them dynamically – it's not a particularly difficult concept to grasp if you present the options to your users – they're smart, stop treating them like they need their information carefully dosed out as to not overwhelm the masses).

Also, while we're here – the single button interface annoys the crap out of me, but that's more of the 'power user' coming out in me. Does the home button go back a screen in an app or back to the home screen every time? (is it ever clear which one is going to happen, or are you expected to know that one tap does a certain action, while double tap does another? – not to mention triple taps).
That's all before the fact that a physical button will eventually wear out, which I suppose is why a non-physical button is standard feature on the high-end iPhones (or buried as an accessibility option to avoid the appearance of building in planned obsolescence).

It also appears whenever searching for a solution to any of these gripes (particularly for Mac OS X), there's always one idiot in the forum that says something along the lines of "That's the way Apple does it, so you'll just have to 'Think Different' because it's better. Get used to it and ascend to god-like status like my fellow Apple cultists.". How about no. The exorbitant price tag suggests these are meant to be machines that are designed as tools to help their users make brilliant works of design, art or music. As such a tool should be something that you can use for work in the way you need to – you wouldn't buy a car that only works on toll roads, now would you? (or only turns right because the company says it's a better way for you to use it).