My opinion is it's the land issue... lack of land. Some courses have bought parcels of land to lengthen their tees. Not all courses have that option. Also, lengthening messes with the course architect's original vision.
Forgive my ignorance on this - I did not grow up with this sport. I do not watch golf much, and I do not have that deep sense of its history that some others of you do...
I am not aware of course records being rapidly and repeatedly broken. What specifically is the issue with the longer distances (and what is wrong with lengthening courses for pro tees? Is it the obvious issue of limited land?)
I don’t really switch clubs for particular courses, but I do have two different wedges, a 54 and 58, that I’ll switch out every once in a while. Here’s why. My bag right now (WITB coming soon!) consists of a driver, 3 and 5 woods, 4 and 5 hybrids, 5-PW, GW, either the 54 or 58 degree and putter. If I carry both wedges, that’s 15 clubs, so I switch them out every so often to stay at 14 clubs.