I guess I'm the only "official word" here, since I *made* the damn thing. That said, let me tell you a few things of interest...
1. The people who are anti-grid are spouting all this speculation about what advantages it bestows upon you. The fault to their argument is that they've never actually looked at the thing other than in screenshots. Thus, the substance of their entire argument is based on wild speculation.
2. The only advantage I get from my creation is that from the #3 view I can determine "that's a hill, these woods are on a slope, and there's a little dip over here that I could probably move through and not be seen." I don't know where you're getting the idea that it's a magic hull-down tool, because it just ISN'T. If you'd actually used it, you'd know that. How do I go hull down? I let the grid make me aware easier that there's a suitable spot for it in the general area, then I get a tank over there and go to the #1 view... jockey around a bit until the view out of the spot looks like it should be hull-down and then I lay a waypoint there for Mr Tank. Once I've actually located the terrain feature I'm looking for, the grid is of no further benefit.