It would be nice if some basic national and indy commanders were gendered and you had a random chance of getting a male or female. Obviously there are some positions where this wouldn't work, but some mages and run of the mill troop carriers could thematically be female.
It would also be nice if some of the weirder creatures were neither male nor female. (And thus not seduceable, at least not by sex.) Is a Vastness male or female, for example?
Even for the more normal non-humans, there's no real reason to assume strict gender roles. Why not have male and female Agarthan troops?
On a more practical note, the code base probably doesn't support random genders. They'd need to be different units
I think the problem of "random genders" would be more in the sprite department
Unless all women of all peoples in Dominions are outstandingly buff and tall
EDIT: Also, if you thought that it's annoyingly difficult to tell a longdead velite from a longdead legionnaire, imagine telling the difference between two fullplated ulmish units
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