They are snooty as hell, and I'll forever associate them with The New Yorker[1]. That said, I love them too! Now, if only we could do the same for awry and other words that trip up voracious readers.

1. https://www.newyorker.com/culture/culture-desk/the-curse-of-...

They were once coming in English-language publications but now are seen in only The New Yorker, The Economist, and one other. Can anyone recall which?

Interestingly, they seem to survive most in naïve than in words like coöperate.

Co-operate is much more common than na-ive (which I've never seen). But both cooperate and naive seem reasonably well accepted.