Sony’s engineers were instructed to keep the PS4′s power consumption strictly under 250 watt, and Ootori-san stressed on the importance of that choice. You’d think it was taken to limit the generation of heat, or maybe to simply help us save on our energy bills, but that’s not the primary reason.
Ootori-san explained that 250 watt is the upper limit, by safety regulations, that allows the use of a two prong power cord. By using 250 watt or more the PS4 would have required a three prong power cord, and of course a three pin power inlet on the back of the console. That kind of connector is larger, and would have negatively impacted the miniaturization of the unit.
Every day, I'm impressed at how well designed and thought-out the PS4 is. Why can't Microsoft do this?