This is to simplify and speed up the current method of using a construction plane through 3 points around a corner. Currently you have to define points by sketching, create a construction plane using these, use the split body function on the plane, and move/delete the 'corner piece' away from the original body. While this is very precise, it is slow when you don't require that precision.
My idea, which I'm sure many have also had, is to simply allow the Chamfer command to be used on corners, no extra command required. Depth of cut and XYZ angle manipulators allow precise control of the chamfer. This would allow very versatile shaping of a form for many different purposes.