have you ever heard of the conservation of detail?
there are things that people simply don't need to pay attention to, or need to detail in the first place. concrete, dirt, etcetera come to mind not everything has to be lovingly hand-crafted: it's perfectly OK to make something out of terrain bricks if it still has charm and looks good enough
plus terrain bricks are perfect for vehicles- they keep the brick count down and collide (reasonably) well. the only difference is that terrain bricks are like, 16 times less expensive then ramp bricks are, and they're easy-to-use to boot