The OP doesn't say a single thing about being able to romance them, though I already know that this is what they want. And considering the fact that demi-sexuality has next to no importance in romancing someone in a BioWare game, where smex is pretty much the end of it in most cases, the results would be the same.
The journey might be written differently - I think that is the goal. I think it's a pretty poorly written romance if we only focus on that last stupid smex scene. Wanting the writing to continuously improve and evolve for romances seems like only a good thing to me (and I'm already well-represented so it's not about representation for me at all).
Sorry, but as I stated in my original post, I think that is highly subject to interpretation.
An expression of affection =/= an expression of sexual interest. Neither does interest in forming a deep friendship or emotional bond. I would also suggest that, as a bard, Leliana may have the presence of mind and skills needed to manipulate someone into not friend-zoning her even if she herself is not quite ready to go there.
I can't speak for the relationship arc with a male warden, as I have not experienced it. I can speak only for the particular relationship path(s) I have experienced. Someone mentioned the 3-or-4some with Isabela, but it looked to me like Leliana went along with it so as not to be excluded from the warden's sexcapades, not necessarily because she was sexually intrigued by the prospect. She certainly displayed a distinct jealous / possessive streak when it came to her relationship with the warden.
I've only seen female Warden/Leliana romance as well, for what it's worth. But I don't think "not quite ready to go there" is the same as demisexual. To be demisexual, you would have to not even consider "there" until you had a substantial bond. Like not even realize "there" existed. I think Leliana expresses attraction (not the desire to have sex with you, as she is not ready to) quite early in the game. You can initiate those conversations almost immediately at camp after she joins you. As to a jealous streak, I find that unrelated. However, if it's merely to the point about the 3-some, perhaps - never did that scene and very unsure about it.
Ultimately, what we think we observe in the behaviors of others is very much subject to interpretation. There are a couple of influential factors that I think may be worth mentioning:
1) I think women in general have a much broader spectrum with expressions of platonic affection than men generally do.
2) People who are on the "sexual" end of the spectrum are probably a lot more likely to read things as sexual triggers than those who are closer to the demisexual / asexual end of the spectrum.
And no, I'm not trying to suggest that Leliana was intentionally written to be demisexual - only that she can be interpreted as such. I don't know whether authorial intent (WOG) should carry that much weight.
"All worthy work is open to interpretations the author did not intend. Art isn't your pet — it's your kid. It grows up and talks back to you." - Joss Whedon
I think the interpretation seems flimsy if it's based upon the fact that she waits to have sex with you (which seems to be the basis). Is it based upon anything else in her behavior?
So now BioWare not only needs to consider making different sexual orientations but also cover the spectrum of peoples' libidos? Where does it end? How about an otherkin NPC and you have to romance all of their headmates as well?
Why not look for a dating simulation game?
I don't think the OP said they needed to. It's a request. The OP never suggested outrage at its lack of inclusion or anything. I saw a thread asking for mabari puppies the other day, and no one was huffy about it (I want some mabari puppies too, btw).
People have a tendency to make things more complicated than they are. I'm a fan of the acronym KISS.
Lets say there is a guy who is only physically and romantically attracted to red-haired women. While his extreme preference for gingers might place him a bit outside the norm, it wouldn't be inaccurate to say he's heterosexual. Would we really need to create a separate subgroup of heterosexual to describe his preferences?
So that's sort of my issue with demisexual. Depending on how it is described it either sounds like someone who is asexual, or someone who is straight, bi, or gay who doesn't take sex lightly.
Is it a problem to examine the attraction spectrum? I mean, I'm a straight, sexual woman (I believe that's the term for what we might consider "normal") who has no issues identifying as my own gender, etc, etc. I'm basic. I'm generally represented, except where women are left out. I don't even understand all the new Tumblr labels sometimes, though I do try and listen and grasp it (like here). But who am I to say to someone their labels or sense of self doesn't matter? If people who are only attracted to red-haired women want to label it and see it represented, what's the harm? I don't really think that's a spectrum we can see exists as clearly as this one (attraction) or sexual orientation. But it wouldn't hurt anyone.
It seems more simple to me to allow people express these aspects of themselves than to be frustrated by it, to me.
Demisexual, as Kallen describes it, fits in with how asexuality is described by asexuals.
For the record, most people I've seen who describe themselves as asexual don't seem to experience the secondary attraction listed in the OP. Or they express that they don't (what they feel, I can only take their word for). That doesn't mean they don't have sex. They might to fit in or make a relationship work because they crave companionship or even release stress or whatever. But they don't experience the secondary attraction.
A demisexual in a relationship would appear and experience attraction almost exactly as a "regular sexual" in a relationship (though obviously any issues, like attraction to others outside the relationship, wouldn't exist - but that is true of many relationships NOT involving demisexuality too).
An asexual in a relationship might fake it but would never experience sexual attraction. They might experience love, companionship, and other related romantic emotions, but not sexual attraction.
At least I think that seems to be the difference. The breakdown of primary and secondary sexuality in the OP really made sense to me.