>>12642214I think fluency pretty much requires you to live in that country, or otherwise constantly use it. You start getting rusty pretty fast if you don't use the language. For instance I grew up with two languages, but these days I use one of them with pretty much only with my mom, so it always feels a bit awkward and clumsy to hop into it. In practical terms it's my mother tongue, but at this point I wouldn't consider myself fluent in it. On the other hand I use English every day, and I'm way more comfortable with it even though it's only my third language. Except maybe not speaking it irl. I rarely actually speak English, so I've never gotten as good at that. So I don't think I can say that I'm fluent in English either, even if I'm at home with reading, writing and listening
So in that sense I feel like fluency is a pretty arbitrary threshold. You don't need to be fluent to have conversations with your mother or post on 4chan
