All this is assuming we are meant to see Sten as a 100% factual narrator on topics of the Qun. I see a lot of people saying "Bioware changed the Qun because Sten said this!" but the problem with that is we're never told that Sten is 100% correct. The problem with taking what Sten says as law is that we just don't know enough about the Qun (even with the WoT book) to make a judgement. Perhaps Sten's role in the Qun is exactly how he said it in Origins: very black and white. We don't know enough about them to say that other roles in the Qun aren't less black and white.
I'm not saying one way or another that Bioware changed the Qun, but we can't really say that Sten is the be-all-end-all on the Qun.
This is very true, and I think as fans people tend to obsess on a single line of dialogue and take it as 100% immutable fact. Sometimes it is the limitations of the medium, but video game fans tend to
- a ) take the first spoken instance of something as canon and anything that contradicts it to be a retcon
- b ) assume that all characters are reliable narrators until proven otherwise.
In the game Tomb Raider Underworld, there's a line of dialogue spoken by Jacqueline Natla to Lara Croft in which Natla declares she killed Richard Croft herself. Several months after release, someone questioned writer Eric Lindstrom about how factual this was. His response was essentially, "That's what Natla said. Is it true or a lie? I cannot answer that as it may become something relevant at a later time."
Sten, regardless of how beloved he may be, cannot speak on behalf of the entire Qunari people. In his words, he cautions the Warden not to ask him about the Qun because, "People are not simple. They cannot be summarized for easy reference in the manner of: 'The elves are a lithe, pointy eared people who excel at poverty." And yet, everything Sten says is taken as the foremost authority, as though he is the mouthpiece for every member of the Qun.
So when Sten says that women are priests, shopkeepers and farmers, is this his own prejudice speaking? Has he encountered an Aqun-Athlok before? Is it common enough that every Qunari is aware of the practice? Is there unspoken disbelief on the part of the Qunari, where Aqun-Athlok are accepted in their role publicly but resented privately by some? What about those who veer the other direction, men who become shopkeepers or farmers because that is what they are good and they are fine with being treated as women within the Qun? Do they share the same acceptance, or possible quiet resentment?
There is no way for Sten to speak to all of this, and his confrontation with the Warden should not be held up as the authority on how all Qunari would have reacted in the same situation. As many others have already said, the Warden never presented herself as a man, and if Bull's take on the Aqun-Athlok is correct, this would have confused Sten if he was expecting a different behavior or if he had never encountered an Aqun-Athlok before and this was literally his first experience with someone born female carrying weapons into battle instead of serving as part of the Ben-Hassrath.
It's fascinating to watch the reaction to this (and to a lesser degree, Tallis' involvement as a Ben-Hassrath assassin in Dragon Age II). Rather than considering all of this material as means to learning more about the Qunari, fans seem to want to rage and declare "Retcon!" and "Contradiction!" instead of accepting that the truth is seldom a bold line that is never smudged or blurred into the various spectrum of colors around it.