I'd like to say that the Discworld example was not just a one-off joke. Dwarf females being indistinguishable from Males became such a huge part of the Discworld story that it caused a cultural revolution and nearly sparked a war.
Pratchett didn't really plan out a roadmap for his overarching narrative, though. Much of what he wrote started as one-off jokes that he then had to explore much more closely, which in turn required his rationalizing one-off jokes into a serious system (or at least one that was more detailed and semi-plausable... if you consider "A Wizard Did It" "plausable").
That being said, I support Bearded Female Dwarfs not only because of Pratchett and Tolkien but also because dwarfs have always been, to me, rugged individuals of a single apparent gender.
This is, again, the crux of the matter - DF dwarves must be like Pratchett or Tolkien dwarves just because that's how you always thought of them. Even if you argue why there is reason it's
possible, there is never any other reason
for bearded females besides "Pratchett/Tolkien did it" (and it's very thin reasoning to even say Tolkien did it, at that).
Dimorphism is important for things like breeding and mating, but sexual dimorphism doesn't have to be something as huge as beard v. no beard. ... The female dwarfs would probably have higher amounts of fat in their chests versus their gut
This really gets to part of what I don't like about the ways that female dwarves are so often portrayed... It's like a combination of a childish gynophobia from Tolkien gets mixed with a pubescent curiosity over sexuality and gets warped into this bizzare form of something that has sexual characteristics of a woman, but in an entirely masculine form, so that it isn't threatening to the male. Yay, it's a sleezy old man with giant boobies in a chainmail bikini. It really doesn't help my impression that the only people that argue for bearded females get it from a 8-year-old's impression of dwarves.
Yes, there are those who go the other way and make "dwarves" that are just short human women (which also have absurdly giant breasts), but I don't see it as being in any way preferable or even less of a sex object.
the lack of a beard makes them feel like something entirely different. And the importance of a beard in Dwarven society is, to me, based on what I've experienced in Let's Plays and imagination. Dwarfs have very little culture (at least at present), which leads to a necessary thing to mark dwarfs as dwarfs. It could be said that in DF, height is the major Dwarf marker as opposed to beards, but it just feels wrong to me.
What about those of us who didn't always assume females had beards? It's just as easy for me to argue this the other way - I've never seen bearded female dwarves, never considered them, so you're the ones trying to change MY view of female dwarves.
It's also very
Planet of Hats to declare the single, definitive thing that marks all things dwarfy is whether there is a beard or not... You seriously can't think of ANY other feature common to dwarves in DF, like perhaps something different about where they live compared to humans that all live in wooden houses, or different about the sort of materials they use to make things, or different about their culture, or different about what they eat, or maybe something very hot and could be applied to any situation to make it better, or maybe some sort of strange project whose size might be characterized as "mega" in some way involving building a Turing machine out of wooden axles and Escherian waterfalls and waterwheels?
That being said, and as a final note, I feel like DF elves are like Tolkien elves. They act like they're perfect, they have an easy grace, and disagreeing with them tends to lead to trouble. I could be wrong, as I've never read any supplemental material to LoTR, but... yeah.
Again, they don't
act like they are perfect, they are literally the embodiment of perfection, according to Tolkien's standards. DF elves are quite clearly part of the reaction against elves that are perfect and magical and beautiful and eternal and have one purple eye and one green eye, but they change colors and sparkle in the sun.
EDIT: fixed some grammar.