I'd argue whether her romance is particularly strong. Given there's been a mod created specifically to remove that gate and provide people access to the romance i'd probably disagree with your second statement too. I don't see any story value in the gate placed on Cass romance that justified excluding people from experiencing a warrior woman romance and that's as someone who is a straight male. Just seems to create fights so people lay claim to a character as theirs and not open to others.
The argument isn't that there's value in the gate, though. His argument is that if there was a well received straight romance, gay people would demand that the character is changed to being bisexual so that they could experience it with their preferred gender as well. I'm simply pointing that out that characters like Solas, Cass, and Cullen (all from the most recent game) demonstrate that this isn't the case. People making a mod =/= people demanding the character's sexuality is changed canonically. That was really my point.
Well, there is the Cassandra bi-mod, ad well as tumblr theorizing she's actually bisexual but actually indoctrinated by the Chantry liking girls is evil.
Granted, I don't think They rapresent the majority of lesbians or bisexual women that played DAI, but there are some.
There are crazies of all demographics.
And, again, I don't see a mod as the same thing as the poster was talking about. He was implying that gay people would demand that the devs retcon a character's sexuality if they were straight and had a well-received romance arc. It was a build off of his "Kaidan was ruined when the devs were forced to turn him bisexual" argument.
Of course, I think my first statement in this response probably hits close to home with that one.