But here's where it gets tricky because it's a game. They don't have the resources to display the natural variation that would actually occur within the species.
I mean, if a character were to say that they would absolutely not romance elves. What is really the difference between:
<snip>
and
<snip>
Doesn't it seem odd that if my Inquisitor looked Anora, a character would find me attractive, but if I looked like Iona, they wouldn't?
Yes, but I don't think humans not finding elves attractive will be a race gate used in inquisition. And if it is it will probably be a more racist thing (i.e Vivienne refusing a relationship with a non-human because it will hurt her standing and cause scandal).
That said though, let's have a look at your example of Varric on the previous page, and a more likely instance of race-gating.
Say Varric doesn't find qunari women attractive because he likes girls his height or shorter, and finds a girl about twice his height very unappealing. Therefore he is only available to dwarves and elves, because elves are still quite small and he can settle for one, even though they are slightly taller than he is. Would you still have a lower opinion of him if he refused to date you solely because you were playing a female qunari, even if there is is no way on Thedas you would ever see a female qunari his height?
And on an interesting note: Imagine it is revealed that qunari cannot reproduce with the other races, and Cassandra, who is deep-down a romantic, has always secretly longed for a family and children of her own. Would you have a lowered view of her for refusing a male qunari due to their race, if she only does so because she knows that they would never be able to have children of their own?