What exactly do you think was behind the decision, and how do you know this?
What was behind the decision was the desire to spite Gamergate and anyone who thinks along those lines, a lot of developers were I'm sure very saddened by the negative view mainstream culture had of games and gamers post-GG (see the infamous "go home gamer girl!" episode of Law and Order SVU) so they go way out of their way to diversify games now in order to send the message to the mainstream that games aren't just a hobby of angry young white straight men.
And you know it's the case with Prey because no less than 3 times you encounter references to gay couples, two female (at least if you play as a female Morgan Yu, not sure about a male one) and one male, three times? Not once, not twice, but three times? On a space station of a few hundred people? What are the actual odds of that? That can't be a coincidence.
Older, similar games like System Shock 2 and Bioshock didn't feel the need to loudly announce side characters' sexuality (there is one moment later in Bioshock Infinite's Rapture DLC where you see a male couple holding hands, but that's to setup Rapture's laissez faire attitude about things by contrast of Colombia's.
So when a game has blatant virtue signaling that's a clear indicator of a post-GG world and reminds me of what a mess modern gaming culture is, yeah that takes me out of the game.
And look, I'll just be honest, there's a movement going around in modern culture to actively promote homosexuality in the media, to not only make it seem like it's more common than it really is, but to send the message that it's superior to hetetrosexuality, it's that whole progressive stack thing where the more unique you are (ie gay instead of straight) then basically the more worthwhile you are as a human being, which is a creepy concept I do not at all agree with, I am a white, straight, male, I am not better than someone who is not those things, but someone who is not those things is not better than me either, a person shouldn't be judged negatively or favorably by things like their race, sexuality or gender, a person should be judged by who they are as an individual.
Not to get too out there and off topic, but someone earlier posted
this panel from the Gabby Rivera America comic, THAT is exactly the kind of shit I'm talking about, what else can you can call that other than gay propaganda? It's sending the message loud and clear "hey kids, be gay! It's awesome!" and I admit it, that makes me uncomfortable, I don't think it's right to try to manipulate people that way.
I don't like propaganda, I don't like social engineering, I don't have a problem with LGBT characters or stories, so long as they're not coming from those angles, brainwashing is creepy no matter what people are being brainwashed into.
And now this kind of crap is seeping into video games, this is the problem.