Sean:
The difference between a 30-yard fairway and a 45-yard one is negligible, if the rough is mowed short enough that it doesn't cost you half a stroke. That's why Mr. Koepka says "fairways are overrated".
Tom
I agree. Hell, you could have no fairway as such, just 60 yards of very light rough.
A few reasons other than strategy why I prefer wider fairways:
1. The natural tendency of green keeping is to properly maintain to short grass areas. Eventually corridor width is reduced or at least effective corridor width is reduced. This is lost corridor width which designers thought appropriate.
2. Rough after 30 (or whatever yards the design intent was) yards often masks cool ground features on the wings. I have seen this countless times. Just take a look at Walton Heath New & Minch Old as examples.
3. When money becomes an issue the rough is often no longer cut at a very playable height.
I would much rather see 45+ yard fairways not only for the strategy involved but the aesthetics as well. It's fine to keep fairway heights a bit higher to make this more affordable. But I don't think its a great idea to depend on a model of 30+30 unless the design is specifically for that type of setup and everybody knows this is the case. Though I bet pennies to pounds the wider fairway courses will more often than not be better than the narrow fairway courses. People forget that when width allows for playability it also gives designers more opportunity to make a course more varied.
Ciao