I love playing tournament golf, especially at match play, and have done it on courses with widely varied slope ratings.
I, and the people I have talked to all agree that when someone who plays at a course with a lowish slope rating is in competition with a player whose home course has a high slope rating, the chances of having anything like a level match is extremely low.
You could probably pretty easily find people who believed the opposite to be true, too.
It's my perception that there is simply not enough difference between courses with low bogey ratings and those with high bogey ratings. It even shows up in the difference between tees. I have a relative who plays a LOT of golf for his own money, and on his home course the game is always from the blue tees 71.9/130.
But in the club's "official" competitions he is assigned to play the white tees 69.6/126
There's more to that than just the slope adjustment of 4.
An 80 from the blues is a differential (ignoring the 0.96, which is best applied at the end) is 7.0. An 80 from the whites is 9.3. But it sounds like your guy goes the other way…
He's told me several times that his net scores from the white tees are nearly always better than the guys who always play white.
He scores two or more shots better from the white tees? His game likely aligns better for those tees than they do from the blues. I used the 80 above, so let's say he shoots some 80s that count from the blue tees for his handicap, but when he plays the whites, he shoots 76. That's a differential of 5.7.
Of course, there's always the possibility that they're not adjusting for the handicap (course rating difference) if they're playing from two separate sets of tees.
So, as a rater, do you think we are completely off base in this thinking?
I don't have enough information to know exactly what you're saying here.
And the course rating/slope system isn't perfect, but it's good IMO. There will always be exceptions - if you're a short, straight hitter you will play one 71.9/133 course better than another 71.9/133 course that might favor a bomber with longer holes but minimal trouble.