It makes all the gay look like "another race", which kinda kills the whole point for the gay community. Mass Effect allowed the character to be gay, by allowing a romance between same-sex HUMANS, yes, Asari didn't count (well, it did, maybe, in the female Sheperd's perspective, because it's maybe hard to ignore the fact that the Asari all look like women), but as far as I'm concerned, the Asari planets and colonies are NOT lesbian planets, why? They're another race entirely, a same-sex race.
There's also the matter of PROFIT. Gay community tend to move a lot of money, so there's this die of the coin. For instance, we have the Green Lantern from Earth 2 (New 52) and, in much more mercenary way, Batwoman, whose constant reminder of being a lesbian and not-very-rare erotic scenes between her and her cop girlfriend reveals much more of a marketing stunt as well as a call for geeks around the world to join in chorus with most men in a song of "women on women is very cool" (despite Batwoman being, imo, the BEST new 52 saga).
What I'm saying is: homosexuality in games, comics, and other "geek controlled media" is still something that is "inserted for profit", much more than "accepting modern society" or at the very least educating people to do so.