I have seen it up close and personal, attended AMA congress on the issue, and they shot down Honda on the 150 in the 85 class. But all this fuss over nothing. The 150 does not have clear advantages over the 85, even modded, they both can run head to head. we see it all the time at our local events , even many kids that ran 150r have went back to the two strokes, lighter, easier to move around and maintain. the 150 engine really is more two stroke like than any other bigger four stroke.
It has very little low end power and very similar top end style power. the pluses and minuses balance out. At races in the elevation, like powder mountain a few years ago we saw the two strokes dominate with holeshots and the top of the class was two strokes.