This is an aspect it shouldn't be understimated.
In a long campaign, repeating similar looking maps over and over can kill the game.
Xcom2+Wotc did great in this regard with plenty of different scenarios (desert, forest, city, underground, wasteland, ecc)
Phoenix Point, on the other side, doesn't look promising because all the maps look like industrial areas, and this will get boring sooner than people may expect.
So i ask, how many different type of areas will be in the game? Can we expect a decent amount of variations?