Alexia has somewhat more of a storyline on the NTR Routes then non-NTR routes at the moment. A benefit of NTR stuff is that it naturally has the "shape" of a narrative, which makes slotting events in easier.
There's definitely a ton of scenes of Rowan with members of the castle staff. We also have two "Rowan x Alexia" story-lines inthe Greyhide Threesome Route (Completed) and the X'z threesome route (Ongoing)
I think that is an accurate description. I keenly await more non-NTR route plot-line for Alexia and rowan together! Its the best type of content in the game; and under-represented.
I think the thing about current poly routes for me as a hetro-male at least- is they kinda feel like a cucking anyway- even though it is a different vibe. X'zeratl less so than Greyhide of course- since you know futa and because you can avoid the dick in it for the most part. The Greyhide arc feels like your wife's vagina will never be satisfied by your character ever again since it will turn into a gaping abyss... very unappealing if you are hetero.
It is fair to acknowledge there is a lot of content where Rowan cheats on Alexia as well. Maybe 3 times more than we have of them being together with 1/3 or 1/4 of it being Gay content.
So a more fair analysis of the content breakdown would be if you like the couple together instead of cucking each-other there isn't a ton going on.
You can be chad rowan and cuck the living fuck out of your wife. Your slut-wife can cuck the fuck outta you- but their mutual plot arc might still be a WIP (hopefully).
NTR isn't the only plot that naturally has the "shape" of a narrative.
Being two lovers trying to maintain their sanity and love while being tormented by everything around them is a heck of a narrative too- and this plot could use some more attention. Should be easy to slot events for it as well ^_^