So the thing that baffles me about ABO

[cashew]

Let's get one thing clear before I start complaining:

I do not care if you like or hate or are neutral toward or never heard of ABO. Fanfic preference does not reflect on your quality as a person. Ok? We good?

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So, I'm not a fan of ABO set up, but since this is the hot thing that has taken over every fandom to ever exist and makes up some 90% of fic that I consume, there's no getting away from it. I get that ABO is basically repackaging some very classic kinks: self-lubercating asshole, sobbing uke, mpreg, D/s, hyper competence, size difference, sex pollen, mind control, dubcon, etc. So, so many kinks in three letters.

But I am genuinely confused by cishet ABO. Like...what does ABO offer for cishet sex that D/s universe doesn't? (To clarify, I'm not talking about BDSM; D/s universe is a kink where people are biologically born either Dom or sub, and subs are biologically driven to get sexed up by Doms because...kink.) ABO's popularity in queer space I understand, but how did it sweep the cishet stuff, too?

I feel like you don't need ABO in cishet sex to get the pregnancy, self-lubrication, blah blah things associated with the female genitalia's biological functions that facilitates sex. So all you'll be getting is the "irresistable biological urge to sex" aspect of the kink, which is kind of already covered by the D/s variant. And as for the size difference...cishet is already all over that without needing ABO getting involved.

The only other variable I can think of is the pheromones vector. Is body odor a widely spread kink I didn't know about?