I said it once, Ill say it again.
I created my own version of the slopes, and you can see the lines between the terrain bricks across great distances. It looks terrible.
Bricks aren't better than terrain, nor are they always an excuse not to build. I'd rather have a repeating, smooth looking terrain that takes 0 bricks as opposed an ugly mess of lines and a finite land area further weighed down by the expense of brick count.