But you have this. You mention it yourself. You've had it with Sera. You've had it with Traynor. You've had it with Cortez. You've had it with Juhani. In fact, you've had it 80% of the time with gay characters. Dorian is the only one in a DA game that has this story.
I totally agree with you that I'd hate to see this be the go-to 'gay character arc', but the evidence is overwhelmingly against this being the likelihood. I don't see what the big deal is that they chose to explore this one, played out, overrepresented story through their own lens in their own setting.
And it's completely disingenuous to say that Dorian's entire personality is around being gay. If you played through this game and you can make that statement seriously ("the rest of his personality" is related to this one plot point), then you didn't pay attention to the game.
I didn't say his entire personality is based around being gay, I said his companion quest reduced his personal struggles to something stemming purely from his sexuality. I've said before that I don't think he's badly written, but his companion quest certainly is. Just by shifting the focus from his sexuality onto one specific male that he happened to fall in love with and therefore refused the norms of keeping his lover hidden, you've changed Dorian's quest from an awkward real-life Band Camp cliche into a personalised issue relating to Dorian's opposition to Tevinter society.
But they didn't do that. They said, "he's gay, therefore it's the problem". When, actually, according to in-game lore, it shouldn't be.
Ok, but Bioware has already addressed homosexuality the way you like it with other characters. What's so bad about one character who experiences his homosexuality in a different manner. It's good to have diversity.
Yes, it is, but only when it makes sense. Like I've already said - numerous times, in fact - my issue is that they're shoving this in where it doesn't fit. The entirety of Tevinter society is perfectly okay with homosexuality, as long as you have a child, but Dorian's quest completely ignores this in favour of focusing entirely on his sexuality as the problem instead of his reaction to it. Dorian's sexuality is the thing that his father tried to change, and it's Dorian's sexuality that his father had a problem with, and it's Dorian's sexuality that's causing the conflict.
You can read between the lines and see that it's probably his refusal to play along that caused the rift, but that's not what his father responded to, and more importantly, that's not what the quest chose to focus on. Instead, they dismissed three games and several novels worth of established lore in favour of giving a short sermon on tolerance that society has heard already from a thousand other voices.