Yeah, maybe. But I hardly use them. And whichever way they are, I'm now used to them.
Whenever I wanna open a particular app using those tiles, I just press the 'Windows' button to bring those tiles up and my hands spontaneously move the cursor to those apps. So grouping (basically rearranging) them would take me away from my comfort zone.
Probably but in the long run you will feel better. As of now, its too much of information overload. Rearranging will definitely improve your productivity.
Anyways here goes mine. Have totally stopped using the Start screen.