The most extreme example I have seen with the notion of unplayable-unfindable rough next to firm and fast fairways was Carne at the Buda Cup, with a few more of the courses we played at various similar stages of too much unmaintained rough. It was a matter of budget I was told. Just not enough money to address the problem. And, the new 9 at Carne was not even open on a consistent basis due to budget constraints. I felt it was a catch-22 impossible equation where a wonderful designed, routed and exciting new 9 holes (even with quite wide fairways) is too much budget, probably due to too few customers willing to pay up for the experience of sleeves of lost balls and frustration after hitting the FW. On firm and fast, sand based turf in fairways, the ball can land well within a reasonable margin on a fairway, and run on the ground as we love to be hopelessly lost two feet into the impossible rough. That simply shouldn't happen.
Players want to hit shots, shape them, and strike the right distances. They don't want to look for balls and have no chance of advancing more than a few yards if they find their balls in untenable rough. I get the water retention of clay and sand characteristics as they relate to species and thickness of grasses. I get seasonal high precip. promoting thick growth. But, it seems to me, that a course operator should be prepared to mow out likely rough in play areas to a findable and variably playable condition as often as possible, for their own sake of keeping play moving efficiently, and giving a customer a fun - not frustrating day.