It seems this is the case. Although I look at two courses in the Phila. area that are about to host PGA tourneys, and I see places where width would cause these guys more angst than higher rough. In these two instances, currently these holes will be played Driver or 3W with a wedge approach... whether they're in the FW or the rough. However...
#2 at Aronimink - If the rightside of the fairway, past the dogleg, were widened to almost the wood-line than tee shots that carry the bunkered dogleg would need to be played with a right-to-left shape to hold the FW or else roll well out of position or worse.
#16 at Merion - It was pointed out to me last time there, that there's rough between the FW on the left and the beginning of the quarry, that if cut as FW would cause balls to more-than-likely scurry further left and also get out of position and possibly blocked by the treeline within the quarry.
And, secondly I was amazed after re-watching the Senior Open Championship, at Sunningdale, at how many of these guys (Norman, Funk, Langer, Kite, etc.) had trouble with the short par-4 on the back (12 or 13 maybe?). Some went for the green, some laid up to wedge distance, some played for position… but none of them, that I saw, walked away with anything better than par. And I imagine they thought they’d make birdie standing on the tee!
So, maybe there are other options that, sadly it seems the powers-that-be think can’t compete with the uniform, high, strangling rough, which limits options off the tee, as the elixir to some defending-par-at-all-costs problem we seem to have.