At Pinehurst there really was no rough, just fairway and "natural area", and the vegetation in the "natural areas" was pretty stunted due to the very dry spring. The only change may have been slowing the greens a bit, and that may have been necessary to keep them alive. Champion Bermuda is pretty heat-tolerant, but it won't survive indefinitely.
This actually happened this morning.
After my practice session, I went into the club house for a visit, and a soda. There is a sign that lists collared shirts as a requirement for play and/or practice.
On a clothes rack for men, selling for $49.99 were men's golf shirts......with no collars.
I talked to the counter guy about it. We had a good laugh about the issue. He went on to say the posted dress code rules, were rules of convience, and were applied at the discretion of the course management.
I use an overlap grip, it's just what is comfortable for me. I have short fat fingers so the interlock grip always felt uncomfortable. As long as your grip is otherwise sound fundamentally it really doesn't matter which of the two you choose.