It's not like that where I'm teaching, in Canada, but I understand it's similar in large swaths of the US, particularly in "red states".
Of course things have gotten worse since COVID, and screen addiction is a problem (I say when I'm on my phone instead of sleeping), but it's not hard to control a class as an experienced sub, from what I've encountered across two provinces and over a dozen schools. I think that's a reasonable benchmark, too, since students are usually on their worst behaviour with subs.