I understand that the area was meant for the mission to the house of reckoning, but i just cant help but notice through my sniper scope that the “un-explorable” area had a lot of work put into (actual trees, rocks, and a HUGE LAKE in a valley seen on the map) , not to mention the fact that the entire area is literally on the tac-map. I Really wish you can go there, but why go through all the trouble to create an entire area that is not traversable if its just for a one way mission.
I imagine the entire map was just procedurely generated and then they proceeded to handcraft each area.
The Road was probably generated and handcrafted for that one mission.
Would be interesting if they did add exploration to that area though, for Easter Eggs and stuff. Maybe in the future.