This topic came up at PAX Prime's LGBTQ talk. It spawned out of a discussion regarding all LI being universally available. Steve and Samantha came up, and I believe it was Dusty that asked the audience if it would have been better if Steve and Samantha were available to men and women. In a room of probably 200-300 people, and from what I remember it was a clear majority that did not raise their hands.
I talked about it with some of the people I was near. The biggest thing was representation. There is someone that gets caught on the mic during the discussion with a statement about representation and included an emphatic "Thank you" at the end of it. And I think much the same way that you dislike the concept of "NPC romances" because they are "lesser romances," and what I also learned in talking with people in the other romance thread about whether or not romance content is vital: by being a romanceable character it's given as much attention and exposure as possible. Many, many people in that discussion mentioned that they value romance content in our games because it's an explicit and unambiguous way for LGBTQ views to be acknowledged.
Back to PAX: for some, it simply felt good to have a romanceable character who's romance content was created specifically with them in mind. (and I think that that is okay) We could handle representation with other non-romanceable NPCs (and I think we should still do that), but I think it's analogous to your concerns about NPC romances. For at least some of the people that like it from a representation perspective, it's stronger representation than with a character that isn't romanceable. Maybe it's just me struggling with my own advantages (especially in gaming), the idea that someone felt "This character is FOR ME" seemed reasonable. Especially as a guy who has a lot of content that specifically targets me and maybe takes for granted that other people don't have this experience as much.
With respect to romance options, the reality is that if we include romance content in any way, there will always be a degree of being unfair towards someone. Spoken differently, I think the only genuinely "fair" breakdown is for romance content to not exist. Because even if there was a perfect split with all the characters you meet in the game in terms of man/woman, and they were all universally romanceable, the reality is that some people are going to look at some romances and consider them superior to other romances.
The most common hypothesis for our romance breakdown will be some notion of 2/2/2. (Disclaimer: I am not giving any validity to the breakdowns, nor the names that I will use... I have taken them from the forum as commonly seen theories/hypotheses).
Cassandra - straight
Solas - Straight
Cullen - Bisexual
Scribe Girl - Bisexual
DHMG - Gay
Sera - lesbian
With this there are 4 options for a male inquisitor, and 4 options for a female inquisitor (which is equivalent to DA2 in terms of the amount of choice).
First off, right off the bat. Anyone that has already decided that none of these characters are interesting to them as a romance have lost. The content is inherently unfair to them because they will not have any sort of romanceable character.
Now even then, some have already pegged Cassandra and Solas as the "main romance." So it's also possible that those that don't like Cassandra and Solas are stuck with options that are innately "inferior." And that might be the case, because some romances will simply be better received than others (especially on an individual player basis).
I have seen some say that they'd prefer 4 bisexuals like DA2, because then it's fair and no one gets access to a romance that someone else does not. Except for those that lose their romanceable content.... Imagine we were to make it Cass, Solas, Cullen, and Scribe girl as all bisexual. To some, this is fairer. Except for those that really want to romance Sera or DMHG. Is this really "fairer" simply because we've restricted people from getting content in the interest of being "fair" by effectively isolating "all those that want to romance a character but cannot all have to suffer together."
So I think on some level we have to pick our battles on what is considered "fair" because I feel that the only truly fair way is no romance content, which obviously is not what a lot of people want. Any decision that we make (and this goes beyond just romances) is going to be disappointing to someone. The trick is attempting to reconcile the opposing viewpoints. I think it's also important to note that having set sexualities brings to the forefront that "4 isn't enough if we want to ensure choice." As such, I don't think it's necessarily accurate to simply say "well do 6 bisexuals" because had we gone into development with the mindset of "lets just make the romances all bisexual" then we may have very well ended up with only 4 (and applied the writing resources elsewhere), because in terms of choice it's all we'd need. Stated otherwise, it's possible that having set sexualities provides the impetus to have more than 4 romances.