Both of these issues come because our ancestors messed up changing the language.
Centuries ago, "thou" was singular second person and "you" was plural second person.
"Thou" got abandoned and "you" lost its original meaning to replace "thou" as the new singular second person.
"You guys" or "y'all" are simply attempts to re-introduce a needed pronoun.
Beware! Y’all doesn’t necessarily include everyone:
> All y'all is used in the Southern United States when a speaker wishes to include everyone being addressed. Y'all may refer to an indefinite set of members of a group, but all y'all definitively includes everyone in the group.
So we get to fight sexism AND bring back cool anachronistic language? I'm in.