Brian:
It's also because swing mechanics, I've long thought, are so highly individualistic that a general discussion board devoted to them would quickly devolve into something like, "Well, it worked for me, but maybe it won't for you." In other words, one thing (swing planes, for instance) doesn't necessarily lead to logical and rationale observations about ball striking, or curing the slice. It's hard for me to look at the swings of five pretty accomplished golfers -- Furyk, Trevino, Floyd, Nicklaus, and Couples -- and think anything other than: "Well, it worked for them."
But in golf architecture, one of the things I've learned from this site is that much of what looks different oftentimes has common virtues or traits. Two pretty well-thought-of courses -- Cypress Point and Merion East -- could not look more dissimilar. Yet they are both highly regarded as some of the best work in golf architecture. That's because they share, I think, several common traits.