I'd say it's because at some point in the near future, they want to turn Xbox into a gamin OS to go onto a PC. They just want to keep the numbers high, so they can fleece more money from them.

While the PS division is making good profits. Xbox struggles anywhere but US.

IF M$ really cared about producing a quality produce for their customers, they would have brought out something like the Xbox one Slim. But that was damage control from M$ as had miscalculated that the bare minimum they could get away with was.