So if they change functionality of stuff they sold, they should either announce officially all the changes they made so everyone can decide which software they want to use or give the ability to revert to the software to the initial state.
Or implement a switch that let's everyone have his own thing.
But if you upgraded to 4.2.1, then there's no official way to go back to 3.x.
I thought at first that putting the lock icon into the taskbar was nice. Until I found out how often I use it.
I have it back now with unofficial help of JB, so I'm good.
But if you think that apple should reintroduce a lock switch with electrical shocking, then I wish you all your gadgets to change their buttons, switches etc. to change their behaviour over time. And if they do, I don't want to hear you complain. Then please embrace the all new functions of your switches and buttons. May it start with your key fob of your car...