When I read all these posts about adjusting truss rods, I wonder if I'm missing something with my own guitars. I've never adjusted a truss rod. My Fender acoustic is 35 years old, and my Yamaha electric is 25 years old, and I've never adjusted the neck on either of them.
Is that common?
I guess it's common for yours. It really depends on how finicky you are about string height. The lower you have the string height, the touchier the neck rod adjustment is. If like some, you have your strings a little higher, you probably won't notice the minute flexing of the neck.
My Martin MMV which is an intermediately priced guitar never needs adjustment. When my son first got it, we put a Fishman pickup in it, and gave it a setup. I don't think I've done anything to it since we got it in 2009. I have owned guitars though that probably three or four times a year the neck would shift because of the change in temperature and humidity (I suppose).
I liked my old Martin's design the best, it had a beefy neck, with a solid Tee Rod in it that neither required, nor was there a provision for adjusting it. I owned it for 44 years and it never needed a neck set either. Of all the guitars I wish I had back, that's the one I miss most.