I like the idea of characters' sexuality being influenced by the players' willingness to pursue them. I'm gonna be a little shit, though, and say it's 2020. People apparentely got into an uproar over female Mandalorian armor. Strong independent lesbian character turning straight because male would attract all kinds of crazies.
I remember a lot of people getting angry because you couldn't do that with e.g. Sera in Inquisition and suspect that was the likely source of a lot of the hate for her, which was often excused as not liking her "stubborn" attitude. I don't really see the point of influencing a character's sexuality though: that's not really any different to the playersexual stuff we have already. I'm slightly on the fence about the subject; using DA as an example, I preferred Inquisition to DA2 but I suspect I would've had a very different opinion if the only characters I liked were unavailable because it wasn't a thing.
Didn't even know/remember Sera was romanceable, to be honest, she was such a little sister character than it never occured to me. Also, there's Cassandra in that game.
I think it's a good idea if the preferred sexuality of the character, and how they go 'against' that, gets actually addressed. Like, staying with Inquisition, the idea of a female character managing to romance Cassandra without disregarding her previous relationship and her history as a heterosexual person is intriguing. If it's just 'we'll bang, ok', then yeah, no real difference.