The market is so huge nowadays and the technical features of different products could be affected by the limitations of the software or even agreements between two parts. The Division was -apparently- affected by a directional contract made by Ubisoft with Microsoft.
A close source to VG24/7 claims the following about the game and the forced parity provoked by the mentioned deal:
[Occasionally], the level of parity in the game needs to be identical, therefore you reduce quality to ensure that everything looks of equal quality,” my source explains. “On The Division, Xbox had a deal with Ubisoft, and part of that deal was to ensure that the PS4 version did not look better than it. The resolution, frame rates, and density of assets could have been higher on PS4, but this was vetoed to prevent issues with Microsoft.
The Division could have had a better performance on PS4, but the agreement obligated to develop an equal version. The industry is complex and deals flood the market with clauses of different nature as the one draw above.