because if its default in the OS then its not removable, and when you said clock and calc should be in, then alot of things should be in too, and when alot of them are in, the 16GB version of ipad will be full easily.

and its not difficult to install them, i prefer they reduce as many junk as possible from the ipad, and yes calc and clock seems junk to me, just allows user to customize the device to their style, should not limit them what must be in and what mustnt.