Nut slots, once cut properly.... should not need periodic adjustment even for the ravages of an extreme case of dryness. Nut slots are something that can be "set and forgotten" with the only thing that may happen in time is that one or more of them wears too low and then they can be raised a number of ways or the nut can be replaced.
More specifically as Murray said action is typically adjusted (once nut slots have been addressed) at the saddle(s).
Most pro Luthiers (who work in the trade and do this every day) set the truss rod, cut the slots and eliminate these two variables and then do the action and intonation adjustments at the saddle(s). This is what I do.
Regarding nut compensation be advised that many of us think it's total and complete bull shirt..... Cut the nut slots properly and there is no need for nut compensation because the strings are not being pulled sharp by fretting. Every day or at least every week someone comes to us complaining that certain chords suck... when done and that they read on the Internet.... that they need Earvona, Buzz Feitin, etc. to solve their problems. We inspect the ax and see that it's never been set-up well with high nut slots remaining and tell them that a simple, well done set-up will solve their problem. A few hours later they are happy as a clam. They also just saved a bunch of money.....
With all of this said, nut compensation is bull, nut slots can be set and forgotten except for excessive wear in time, etc. The notion of an adjustable nut has more advantages for a production/f*ctory environment for what the value add of most small builders likely is. We are not supposed to be the folks who slap them together, next, and call it a day.... Instead we are supposed to be endlessly toiling by candlelight etc.
There is also the idea for some of us purists... that some adjustable hunk of crappy metal on an acoustic guitar might look a bit like the Jaws character in some James Bond movies.... and way out of place.
I also have to add that in my business and in the work that I did all my life for a major corporation before being a Luthier when someone asks for something it's always important to understand why. I'm not talking about push back but the fundamental idea of "defining the problem" properly. It's pretty hard to help anyone if we don't understand whey they want what they think that they want.
Are customers always right? Hell no and again in my experience they are often wrong and part of our value add is to be that "trusted advisor" who will actually "listens" to them and even more important tries to "hear" them and get it right the first time in so much as why they want what they think they want.
A client who asks me about nut compensation and again it happens frequently simply does not understand that their lousy guitar is currently not set up very well.... 99% of the time that's the deal.
![[headinwall]](./images/smilies/headbangwalluf8.gif "Mad")
me included. So we don't...... 
