Post-game roam doesn't even make sense considering half of the possible endings.
It was added just as a convenience thing. Clean up those contracts you missed, play Gwent without having to rebuild your entire deck, travel around taking screenshots without having to unlock all FT points again, take on those tough creatures you might have missed etc.
It was never meant to be taken as a serious canon situation (The pop-up text box made that abundantly clear to me), and this whole scenario strikes me as the perfect example of, "Damned if you do, damned if you don't".