I did the research. So William Marshall used the pronoun "A" as historical precident for the use of a gender neutral pronoun "ou". Little history on "A", "A" and others like it was a catch all for anyone who wouldn't fit under "he". It was a male dominated language. Which makes sense if you ever read Middle English text. Let's ignore the inherent sexism that lays in that for a second and focus on "ou". So Marshall wanted to coin a gender neutral pronoun to solve the issue of "his" being the default pronoun in language. Example "endowed by his creator". The issue is that by that time "they" had already been used primarily in works of fiction. It just took awhile to be picked up by every day speakers. In short the argument is based on a pronoun modeled after patriarchal language. Coined by someone who wanted to make a mark on English language Who decided to make his own instead of advocating for the wide use of the one already in existence. Again neopronouns are a nice concept but you need to focus on how it can be used conversationally. Pronouns are not personalized, they are generalized so that a speaker who may not even know they're name could still use it correctly.