"Reorganizing seemingly for the sake of reorganizing"

These things often to be the observable consequence of political battles between executives. From what I've observed there are always clear winners and losers in these battles (although it may take a while to work out who lost and who won). From the perspective of the execs who were for the re-orgs and who come out on top these reorganizations are positive things even if they are bad for the company as a whole - typically they don't care about the company as a whole only for what they can get out if it.

Edit: A colleague once said that the behaviour of executives became far easier to understand and predict once you found out their individual bonus calculations were done (which, of course, we weren't supposed to know).