The way I see it is if you are specifically expecting something, then the mere inclusion of a gay romance option won't mean much to you. In retrospect, I was much more concerned about whether we would get a gay companion in the first place, regardless of any other specifics.
That's perfectly fair. Although if you're going in expecting something specific then, frankly, you're a fool.
To be honest I always expected some form of s/s content, this being the DA franchise. But you're right. That still counts as an assumption. And all assumptions make an ass... etcetera, etcetera, etcetera...
So I was quite thrilled to learn about Sera, both because it wasn't something I expected and the simple fact that we finally have such a companion.
We (meaning f/f relationship players, I guess) had such a companion in KotOR and ME3.
Juhani... I think we can all agree that was very much baby steps BW. Admirable, but perfunctory.
As for Samantha... I feel that I can't really say anything lest the Traynor mafia come and silence me in my sleep.
Let me simply say that these examples just didn't/don't cut it for me. Perhaps that might go some way towards explaining my scepticism?
I get that this is what some people want. I don't agree. I have never agreed. I am never going to agree.
If I'm being completely transparent, I think the 'best' thing to do right now would be to make the other female companions (assuming they are all romances, which apparently they are) available for both genders. People seem to think Cassandra will be a straight option and I'm inclined to feel the same way. But while I hope that's not the case, it's looking increasingly likely that it will be now that Sera has been confirmed as a f/f only romance, with Vivienne ending up as the bi/playersexual option (hence my 'mix of everything' comment earlier).
If I'm being similarly transparent... I don't care. I don't care about the DAI characters. I don't care about DAI.

It hasn't grabbed my interest. The characters haven't grabbed my interest. I have no current desire to play it. At all.
So I hope you're right. I hope it appeals to a broad range and has something to cater for as many people as possible.
I'm still not going to be one of them.