I noticed that over the 2 years that I have my main guitar (finally done, after 2 years!!!!), the neck has 'changed' a bit. a more worn-in feel, and the frets have worked their way too. not popping out or something, just leveled a bit due to playing.
so, when I'll be getting her first leveljob, to get away of the dints in the frets (which will happen in I suppose 3 to 5 years), the frets will be dressed again, after having taken into consideration the working of the neck. I can't believe that a neck, fresh from the factory, will have the same condition as it will be 20 years from now, even if it never will be played.thats also why warmoth won't level, and i don't mind. Its all just so we, the customer, can get the most thought-over guitar possible.