“y’all” fills a legitimately useful gap the English language has. Other languages have a word like this.
Edit: also something cool I just found out, some languages have a way to disinguish “we” (you and I), and “we” (me and the rest of us, not you). It’s called clusivity and is missing from European languages. Many indigenous languages of the Americas and Oceania have this, as well as Vietnamese and northern dialects of Mandarin.
Spanish has “Ustedes” (except in Spain, they use “Vosotros/Vosotras”)