Next time someone complains about singular "they" I'll point them to this 17th century rant against singular "you"
@kacey of course on the West Coast of Scotland, Gaelic speakers moving to English needed a plural form of you, so they devised youse. And in the US both youse and y’all may be heard as plural forms to fill the gap caused by using you as a singular.
So we have gone full circle.
Kacey