It's entirely possible NX can't run the game adequately.
Yes, Square-Enix has confirmed Dragon Quest XI, but in that most recent interview, it sounds like DQXI for NX is its own version and not a PS4 port either.
Square-Enix also has said no to Final Fantasy XV for NX as well.
It's entirely possible the NX simply can't handle PS4 ports very well, and that to put a PS4 game on the NX you basically have to build it from scratch.
It sucks but the reality is the NX hardware performance may be closer to a Wii U than it is to a XB1/PS4, which would cause problems for having versions of PS4/XB1 software.







