Through my readings of the books, I have been fascinated by the way Terry uses the dwarfs as analogies for various groups. Quite apart from the fundamentalist types that rail against change, I also see a connection with the LGBTQ community.
Getting all recursive, I think that being able to use dwarfs as models both for religious fundamentalism at its most intolerant, at one end of the spectrum and alternative sexuality (which is by definition tolerant) at the other end stands as another example of the genius of Sir Terry Pratchett. I know I'm preaching to the choir here, but the overused word "genius" really does apply. He presents us with a full spectrum of a major aspect of the dwarfish nature, thus reminding us we can't stereotype them without being peawits. A peawit, by the way, being defined as someone who judges by the group.
Having accomplished that impressive feat, he also illustrates the middle of that spectrum, reminding us that most dwarfs are like most people: just trying to make their way in an uncaring universe. (Personally I take issue with the uncaring universe notion, but we know Sir Terry was fond of it, and what matters is the "making their way" part of it.)
All the while continue to evolve a portrait of dwarfs and dwarfishness that can make us stop and think about a lot of things, including our language. Accomplishing all this accomplished seamlessly in the "comic fantasy" genre is the pinnacle of genius, because accomplishing any of this in the genre of comic fantasy would seem on the face of it to be nigh-well impossible and probably too pedantic and narrative-killing to be readable at all. And yes I deliberately tried to make that sentence as long as I could.