John:
Very well; my apologies. Some participants here do NOT know how the system works, and LOTS outside this forum have no clue.
My experience is the system does work quite well the vast majority of the time. Things like high rough are accounted for in the rating process. However, what we can't account for is if they tell us rough is kept a certain way during summer time (which is what we base rating on), then you happen to play a course a few times when rough is abnormally high. That would skew things for sure. Same thing goes for speed of greens, abnornmal wind, etc.
I firmly believe the system works... not always, but way more than enough to make it valuable and worth keeping.
TH