That's one view.
The other view being that Nyx is a (presumably straight as she's writing a straight AVN) female so is writing the relationships from a female POV, and an FFM throuple is mainly a male desire unless at least one of the females is bisexual so has desire for the other female in the throuple as well as for the male, two straight females with one straight male is not on the female bucket list so it's unlikely to be something that she'll have in her AVN.
Yeah I call bullshit on that, mainly because Nyx's track record with this game is as evident as a getting ones hands caught in a coke jar.
Nyx knows how to draw interest and tease empty promises with things. Yall remember the whole mom thing? Teased the maybe chance that maybe something could happen, yet thanks to Patreon it never did, yet she still teased it regardless even after the rule went down.
Layla and Elana could 100% work out if it wasn't for the bullshit that Nyx pulls. The most realisitc and plausable means to start it would be for Layla to talk to both the MC and Elana and ask how they feel with one another, and to have the MC either blow it off or be straight honest with his feelings, which could result in Elana being miffed at us and saying theres nothing there, or being honest as well with her best friend. All of which, depending how honest we've been and how the relationships going, maybe Layla considers allowing us to date Elena, or be on the fence, or be entirely against it. The foundation, the chemisty, the moments, everything is there for this to possible happen.
But, oh yeah, Nyx wants us to force ourselves to be attacted to one woman and be goodie goodie two shoes, while again teasing maybes and riling up her fans for the 'idea' and 'hope' for such pairings, only to backtrack and say 'Yeah, not happening, sowwy. And if your upset and complain about it or even have a constructive idea on how it could actually work out otherwise well, I'll have my mods ban you. Tehe!'