Again, I just wish they they had announced she was straight when they announced her as a LI, would have probably saved a lot of pain. When Sera was revealed as a lesbian she had just barely been revealed as a companion and a LI, so it's not like the same expectations where there, the reveal was immediate.
It's important to remember the context by which she was announced too. Now you could argue that it wasn't well thought out on our part, but I don't think (I'm not in marketing) that our plan was to announce that stuff then. I don't think it's a surprise that of the two that were announced at that PAX, one was pretty much already confirmed by an enthusiastic voice actor a few days earlier. I view it more as a reaction reveal, but maybe I'm just biased towards my friends/coworkers (which I likely am).
Admittedly I didn't really see it as something that would get a group of individuals more hopeful than they already were (I know Cass as a f/f pairing was already coming up), so maybe others did too? Sure it's an example of me perhaps being somewhat daft/blind to it all (whoops) and failing in having perspective. So yeah, maybe it was the wrong person to choose from who was known at the time. It's pretty clear that some felt we were dragging them along, unfortunately.