eigenspaceWit, unker, Git: The lost medieval pronouns of English intimacy
https://www.bbc.com/future/article/20260408-the-extinct-english-words-for-just-the-two-of-us
Also sad is the fact that “you” is now used for “thee” and “thou” and such. The older variants could distinguish between “you” plural and “you” singular
Before I moved to the South I (a non-Southerner) did not feel comfortable saying "y'all". But "you guys" seemed sexist. I have since spent a decade in the South and I have not picked up much of the dialect, but I definitely say "y'all" now.
"W'all" would be nice to have. I guess it's not a thing because it sounds too much like the things that separate rooms.
"Guys" (without a "the" in front of it) is uncontroversially gender-neutral in most contexts in at least some parts of the US. I'm not sure whether folks worried about it are from places where it's definitely not, or places where it's not used much at all so they're not aware that it's a non-issue in (at least many) places where it is.
I do prefer "y'all", though. I think it's the best one we've got, of the options ("yous" being another big one, and ew, gross)
I also love the nuance of "y'all" and "all y'all".