There are so many cultures that speak English though. I'm only fluent in English, but as an Irish person who spent parts of my childhood in England and Scotland

There are so many cultures that speak English though. I'm only fluent in English, but as an Irish person who spent parts of my childhood in England and Scotland, I feel like I have a deep (fluent) understanding of Irish and English culture, and a second language equivalent of Scottish and American cultures, maybe at a third language equivalent level I could add Australian. All of these cultures are easily as different from each other as non English speaking European cultures like German, French, Italian. I've also spent the last few years living and running a business in Vietnam, and while I've failed hard at learning the language, I do work with Vietnamese people everyday and I am growing to have a reasonable understanding of Vietnamese culture, even while I would struggle to have any kind of deep conversation in the language.