Yes, but it's totally possible to buy European jet-style helmets. You can order them from any fire supply. I know only one guy who uses one, he's British, and gets made fun of constantly for it.
You never see them because the 1780 leathers look, and I quote, "cool as fuck, bro". You'll get guys spending $1000 of their own money to get a leather NYC style helmet that is less safe than the one supplied by their company.
Fashion firefighting is such a big deal. You'll still get people who refuse to wash all the cancerous carcinogens off their gear because it "looks cool" to have them smokey.
Still going on. American firefighters widely use outdated helmets that haven't changed much in two hundred years. https://www.ctif.org/news/texas-joins-other-progressive-us-f...
Europe uses much more modern, safer, lighter ones.