As a young girl, I always hated the default to he & his.
Made me think my gender wasn't as important as the other.
Adding a new non-specific genderless pronoun would only serve to confuse.
Referring to a person as "it" is demeaning, as "it" is for articles, and sub-human life-forms.
Not appropriate to use with humans, it's insulting.
Having friends who cross-dress and enter pageants for cross-dressers, I am good with referring to them as "they" as quite often they name their other persona...therefore being more than one individual!
And whatever gender an individual identifies with, I will call them whatever they prefer to be referred to as.
But I must say, when "Ban shakes their head" I do see a two-headed life form...