Matt:
This is a great question and subject although it has been discussed quite a bit on here before.
Standardization of fairway widths is very common in today's golf and architecture (although a few of today's architects are really varying some of their fairway widths) and ironically it was very common in golf architecture of yesteryear even though back then the standard fairways widths were generally 50-60 yards instead of today's 30-35.
I'm a huge proponent of varying fairway width for the simple reason that it's just not hard to tell which holes strategically call for width and which don't.
But the long and short of it to me is that varying fairway widths and varying them sometimes substantially does just that, it varies things----eg it creates variety, and in my mind variety of all kinds is pretty much always a good thing in golf architecture, and standardization in a formulaic sense is not.
What great golf course really varies its fairway widths? That first great course in America does---NGLA. It always has and it still does. One or two of them maybe around 30-35 and some of the others are effectively 80-100+