Ian,
I think you have to differentiate "playing" from "observing" when one or the other is your main focus.
Some people have incredible, broad powers of observation, others have tunnel vision and only see the golf course through their game.
Most people playing a meaningful round are focused on their objective/s, not the totality of the design.
Evaluating a golf course through your own play is erratic at best, unless you're a plus handicap.
Too often, evaluating a golf course through your own play is constricting or myopic.
When you factor in the variable/s in one's play it gets even more complicated.
When handicaps are determined by taking the differential between the lowest 10 or your last 20 scores versus the course rating/slope you begin to see that variable. A 10 handicap golfer might score 80 on a par 72 course and he might score 100. Certainly the gap between the two scores is so considerable that the golfer's perspective of the golf course might be vastly different for each round.
And, in both cases, his evaluation might be mortally flawed.
Sean Arble,
Seth Raynor, a non-golfer comes to mind as the perfect example of a non-golfer's ability to evaluate a golf course.
But, Seth Raynor's purpose for being on a golf course wasn't to play golf.
Seth Raynor was trained as an engineer and a surveyor, and tutored/mentored/educated by one of the finest architetural minds of his time.
But, the question originally posed wasn't whether or not a non-golfer could evaluate a golf course.
The question posed didn't ask for an arms length or disinterested party's opinion, it asked whether an interested party, a golfer playing a round on a particular golf course, with a built in bias, should insert that bias in evaluating that golf course.
My answer, as convoluted as it might seem to some, was that the architect must forge a disinterested challenge that favors no particular game.
Once a golfer evaluates a golf course on the basis of his game, he's no longer a disinterested party without bias, he's clearly predisposed, and as such, his evaluation is inherently flawed.
That's my premise and I'm sticking to it.