They did say that they prefer having set sexualities. Them doing the ambiguity in DA2 was just since they had only 4 romances to work with. And some people's reactions to it sure seemed to turn them off to the idea of doing that again.
I value representation more than those that were upset because of "realism" or anything like that. I'm more concerned with people saying "I like to see people like me because I rarely do" and was able to make the connection of going "yes, I can understand that and it seems pretty clear."
I used to be more keen on "playersexuality" and the notion of the characters were "ambiguous" in the sense that, from the outside looking in we couldn't definitively state that a character was a particular orientation. Until I learned that bisexuals (and perhaps bisexuals) have to battle that all the time. Stuff like that, (coupled with my own frustration towards those that would always decry how unrealistic it was) made me reevaluate. I made a choice to refer to them as bisexuals because there's a valid case that any of the companions can be shown as being attracted to either men or women. (Someone like Maria can probably recall that I used to speak more for the other side, as I remember her pointing out that my original defenses of metagaming weren't really applicable).
So when I say that I moved away from referring to Merril (or Fenris) as "ambiguous" it was more from the outside perspective (Allan can look at Merril and say she is gay, straight, or bisexual), as opposed to any concept of "Merril is uncertain/unclear of her own sexual orientation."
In the context of DA2's romances, there was a very even split between who would like something like that and who preferred not to, when discussing LGBTQ content at PAX Prime.
Before this thread, the concept of someone with your sexuality was foreign to me. Like, entirely oblivious. And it was reinforced because my mind kept trying to put you somewhere else. (i.e. maybe they're pansexual and gender is irrelevant... maybe they're demisexual because you need that deep connection... although can't demisexuals still have preference!? I don't know!!! System crash: CONFUSED!!!). I still struggle with things like non-binary gender because in my past 30+ years, that was all there was to me.
Hopefully that can help provide some context!