I think I've mentioned Ann Leckie's books, before. Maybe not this thread, but I'm not checking back.
The generallly gender-agnostic SF universe of her Ancilliary novels has the main (focal) civilisation default to "she/her" for everyone. You know it s not an Amazon Civilisation (or parthenogenic, or LevGuinian but off-page, etc) just not a social distinction.
In co-universe book Provenance, the world(s) of a civilisation on fringe of the above Empire go for "e/er" (I think)
until the person chooses to qualify either way. Self-selecting, as is their decision to 'come of age', or at least that's how it works with the protagonist and er contemporaries (seemingly without biological presumption), but I'm trying to remember if part of that was class-privilege.
It seems that other societies in the galaxy (further? I'm can't recall how far away the
real non-human aliens of the series come from) may have different standards... Probably there's an "Earth vanilla" protocol out there but, without making it
the issue of the writing, I think it'd be just mentioned in passing (like how the Ancillary concerned at one point says how she purposely does not
wear gloves, to pose as an outsider for tactical reasons), letting the reader just settle into the gender-blindness as much as they do the idea of death-of-personality AI-controlled 'bio-drones'.
Anyway, I say fill your boots. I was just thinking about those who would feel self-righteously afronted. Who I don't think should be pandered to, so let 'em be...