Anthony,
Not only do we take them into account, but we frequently are second-guessed in our decisions. For that reason, many architects (and not just pros) tend to stick to bullet-proof, boilerplate choices for the region their course is in, whether it's really the best choice or not. And that is one reason why many courses look a lot alike.
I'm always trying to figure out some sort of different twist in whatever region we're working so our courses will look a bit different. Pete Dye used to do that all the time, though his batting average wasn't particularly high.
Tom is right, of course, except with all the grass choices out there, I'm not sure if you can say there is a "right" choice out there in many cases. When it comes to green (and yellow/brown, as the case may be), its no longer black and white, but grey area in your choices.
Any more, its what you and the superintendent favor - water tolerance over cutting height, or color? Disease resistance of a mixed stand or playability of a monoculture? Putting quality of the A1-A4 blend, or a medium maintenance L-93 which ain't too shabby either?
Grass selection is getting to be an area where there are no shortage of opinions, much like greens mix was a decade ago. Most projects have agronomists, but so do most seed companies, and we spend quite a bit of time listening to sales pitches of the latest and greatest.
Worst yet, is that the contractors often don't care, and may substitute a slightly different brand, or the suppliers may put in a slightly different mix, all to save a few pennies per pound. So, that is something I have taken to watching more carefully after waiting a year to find I didn't get the results I wanted the next spring!
As to using new grasses, any architect can tell you stories about being the first to use a wonder grass - for some reason, it hardly ever works out as well as advertised. Whereas Penncross bent, for example, had twenty years of development time in plots, and now fifty years of known data, some of the new hybrids are developed in less than ten years. Many consider the process less reliable, and in any case, the "safe" choice is something you have seen work in a similar climate over "proclaimed" advantages of some new turf.