It would defeat the purpose of S.M.A.R.T. if you could just blow a hole in the wall, and i didnt see anything that hinted to destructable enviroments
It depends. Blowing holes in walls is pretty cheap, but it'd be cool if you could trigger small environmental problems. For example, if there's an exposed pillar, you could plant an HE charge on it and riddle a narrow path with debris, which would hinder movement. This would open tactical decisions. Do you choose to rush the open path that gets to the objective faster, but has a lot of Soldiers, Medics, and turrets? Or do you take the smaller path and deal with less resistance, but take more time to crawl through all of the debris?