“the ultimate inclusive word: both gender-neutral and non-binary, singular “they” refers to men, women and persons who are trans or gender-nonconforming” Dennis Baron
Academic and author Dennis Baron has a new book, What’s Your Pronoun: Beyond He and She. You can find him on Youtube for an extensive interview in addition to the link enclosed for this post.
https://www.theglobeandmail.com/llopinion/article-the-canadian-politics-and-history-of-he-she-and-they/
I heard an editor of the dictionaries — Merriam-Webster, I think — also make the case that “you” was a plural pronoun in the past, with the singular adopted in the last few hundred years. Guess good ole ahistorical Jordie must be spinning in his rehab cell now.