I'm thinking the point some of us were trying to get across was your cornering must be limited or otherwise your tire wouldn't be squaring off. I also understand your point about the "factory" shape but like Alex said, if you grind the "points" of the square you are decreasing the amount of rubber contacting the road which in turn decreases your contact patch which in turn speeds the wear on the center of the tire.
I guess in summary, the tire should last longer with no grind but would not corner as good as the factory shape.
I hope the way I've worded it makes sense...
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