I’m from Vietnam. I’ve been in the UK for 10 years now. When I met my English husband 13 years ago at 19 I knew 0 English. We communicated using machine translation. So that’s when I started learning English. Fast forward to present day after immersion, living in an English speaking country, formal study, etc. and I’d say my writing and listening (understanding) are good, but my speaking and reading are still bad. I kind of gave up on trying to become fluent at this point.
Depends on how you take it. When you say anyone who doesn’t have a neurological disorder can do something it puts a negative light on people who haven’t done it. Not being multilingual is a common negative statement about Americans, for example, always comparing them with Europeans. But most Americans don’t live close to multiple places where different languages are prevalent, as in Europe, so their only reason to learn other languages is purely academic. Similar to the average person’s motivation to learn calculus. I think I framed it pretty realistically - certainly with more brevity.
No, it simply doesn’t. If one doesn’t want to learn a language, they simply shouldn’t (and this includes wanting to want to learn a language). This is a personal issue, and it should not be an excuse for spreading any kind of misinformation about the topic.