If BioWare didn't care about gay men, there wouldn't be any gay romances at all. End of story. They don't have to invest resources into romances that they don't care about. They have a limited budget and they could prioritize it in other places if they didn't care. It's really that simple.
Of course Bioware doesn't care about gay men, if they did there would have been a gay romance that was actually made for gay men by now. Nevermind the fact their priorities are money, appealing to everyone, and making everything as non offensive as possible all the time so it's going to be impossible for a real gay male romance because a realistic, honest raw and graphic portrayal of two men in love, in a relationship is going to be offensive to some uptight twit or religious goon somewhere no matter how well written or how likable the characters are, and it's going to cause controversy for the game, which might make it not sell quite as well and therefore disallows it's existence.
And if anyone has any doubts about my assertion their concern for gay men is dubious at best here,
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•Sky- Barely any content, censorship kiss scene. = censored downgrade of the heterosexual romance, no thanks.
•Zevran- Dirty bisexual stereotype who admits he greatly prefers women and basically trades his ass and penis sexually with dudes in order to assassinate them.
•Anders- Previously heterosexual character who magically started liking men for "representation" and whose bisexuality is dependent on playing a male Hawke so Femhawkes won't have to feel disgusted their mage boyfriend takes it from behind.
•Fenris- Magical bisexual. (Probably the only vaguely believable person on this list since I don't think he mentions being interested in either sex independent of Hawke)
•Kaidan- Heterosexual man with an in house fan mod style homosexual romance that is completely out of place for his character.
•Steve- Poorly implemented romance that involves way too many "gay" dialogue checks, overly dark lighting to try and mask the fact it's two men being intimate and less content than it's heterosexual counterparts.
•Iron Bull- Arguably heterosexual since Adoribull was added for inclusion and felt borderline out of character, and he comes off entirely heterosexual otherwise.
•Dorian- The ultimate gay male stereotype and queer man cliché who was marketed toward women who want a gay BFF | women who want a "gay boyfriend/husband' | enlightened "progressive" men who think sex acts with males makes them seem tolerant and show they aren't bigots | yaoi hounds | easy to placate gay people/gay rights organizations | - complete with the obligatory dad who hates gays and coming out story, thinking two men can only have sex and not love and acting shocked when told otherwise, being sassy, sarcastic and loving fashion, constantly complimenting women and showering them with adulation, and the ever predictable we have to break up/separate story finale done as seen in 85% of gay male romance stories since antiquity.
The thing about Kaidan; he is not an ambiguous pansexual character and he did show multiple interest of his preference for women (and asari). He always show interest in FemShep and even unromanced until the end, he still say that he always has feelings for her. He became instantly captivated by the female dancers in Chora's Den. He talk about Rahna as the girl he had feelings for. After Liara was picked up and if BroShep took interest in her, he will say that he saw Liara first. When no interest was shown, he will say he look at Liara like the way he'd appreciate art. At Noveria, when Quinn talk about sexy Benezia in pinstripe dress, Kaidan inserted that he had seen something like that on fetish sites. If unromanced or Liara was romanced, Kaidan will take an interest in Ashley and vice versa. In ME3, he will say something that he would have been a goner if an Ardat-Yakshi hit on him. Of course, everything is up to interpretation but his specific line that mention his preference for BroShep is at the Apollo's Cafe and nothing prior to that.
This.
Add Kaidan saying EDI's body looked really "good" in ME3 too.
Arugably his first line that indicates his liking, not preference, for BroShep, is Kaidan asking him if he is flirting with him after BroShep's first visit to Kaidan at Huerta (after Kaidan awakes). Kaidan makes a line about how his L2 implant has gotten better with age, and BroShep can say maybe its Kaidan, triggering that line. Also, depending on at what time in the game you lock-in Kaidan's romance at Apollo's, you can visit Kaidan in the Crew Quarters after the mission to rescue Jacob and the Cerberus scientists on Gellix.
BroShep asks Kaidan if he is flirting with him this time, and Kaidan says clearly he isn't very good at it, so he needs practice with him.
So there are actually two times before the meeting at Apollo's Cafe where Kaidan can mention his attraction to BroShep, not his preference because preference indicates he is solely interested in BroShep and men, which is not the case as you have previously mentioned before with Kaidan's comments about his attraction to women and asari also.
It's moot though because all that is still within the Bro Shep vacuum, which is effectively overruled by the fact everything outside that story arc clearly indicates he's heterosexual.