In Tolkien’s works, there are Dwarf women, but people haven’t seen them, leading to speculation about their appearance. No canonical source written by Tolkien has Dwarf women having beards. In fact, he explicitly cut all the text where he said they did (because initially he did), which suggests, based on Tolkien’s general behaviour, that he changed his mind on this (he changed his mind on a lot of things - the origin of orcs particularly). However, very nerdy male Tolkien fans used amusingly tenuous inductive reasoning and the fact that Tolkien had written this before cutting it (according to Christopher Tolkien who is not a wholly reliable source), to determine that it “must” be the case, and then this lead to a greater body of nerdy dudes saying it really must be for all dwarfs because it’s “hilarious”.
So you got into this situation in tabletop where most people don’t think female dwarves should have beards. Like maybe 60% of people. But if you look at the group that says they definitely should (which is actually smaller than 30%), that group is like 90-95% male. And they’re not hardline sexists. Many aren’t even consciously sexist. But they think what is “funny” to them is more important the opinion of women on the matter, even though they’d all have the screaming ab-dabs if male dwarves all got shaved because that was “funny”. This is particularly an issue in tabletop roleplaying games, because women often want to play dwarves, but this subset of men want to control and dictate what those dwarves are “allowed” to look like, even though they would never tolerate such in reverse.
So you see this casual and repeated dismissal of women’s opinions on the matter in favour of what men think is “funny”. And if anyone, male or female, argues with these dudes, they’re incredibly shocked and appalled that anyone might suggest they’re anything than righteous dudes, because making dwarf women have beards is like, feminist, man (they say, whilst shouting down the women who disagree with them).
It’s notable that when push comes to shove, when a female audience is a significant part of you game’s audience, female dwarves always end up without beards, because most men are either capable of listening to women on this, or another kind of sexist that thinks women with beards is “creepy” so end up doing “the right thing” for perverse motives. This is especially true once a game gets actual art. Even in Dwarf Fortress, female dwarves do not have beards (well, not routinely).
Thronebreaker sounds like it’s just copying Witcher here, and Witcher was probably drawing from nerdy Tolkien dudes, and just trying to make the best of a bad situation (and possibly succeeding!).