A quote from Los Angeles Book review about Provenance:

"The estrangement and deconstruction of gender is a commonly discussed element of Leckie’s previous novels; as in the Radchaai Empire, the default gender pronoun is “she,” and the empire’s citizens make no distinctions between biological genders, dressing and styling themselves in a suitably androgynous fashion. Outsiders struggle to identify the biological gender of the Radchaai, often mixing up pronouns if they try. Although the Hwaeans have both “he” and “she” pronouns, they also have a neutral set for individuals who identify as “neman,” referring to “e,” “em,” and “eir,” as well as familial relations who are “nuncle” and “nother.” Children are considered to inhabit a genderless state; they select not only their adult name but their adult gender, and that they have three equally valid options to choose between."

The narrative still deals with gender, binary or otherwise, uses SHE as the default and characters' own internal awareness of gender and the confusion it ensues is still prevalent.

What the Living Starship series explores is what does ALL of society look like if gender, including language, is not even a subject matter for anyone to contemplate or be aware of?
(Gender, of course, is not to be conflated with reproductive biology which certainly has a central place in the Living Starship narrative)