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.
TBH that sounds like saying anybody can become “fluent” in calculus if they just apply themselves. In my experience that’s just not the case. People have different aptitudes. You might be right that with sufficient motivation and unlimited time, anyone without a neurological disorder could theoretically learn a language, but in a real-life context where people have a lot of other concerns and responsibilities going on, I think it’s much more reasonable to say “probably but it depends.”
I mean, this is a valid point, but framed negatively.
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.
The problem with your first point is that in the case of language acquisition, there is no “aptitude” for it. The process of language acquisition is more or less the exact same in every person, the only exceptions being people with literal neurological disorders. And you don’t really need unlimited time for this process. It takes around 1.5 years of immersion at 18 hours per day to reach 10,000 hours, 3 years at 9 hours per day, and 6 years at 4.5 hours per day. The trick for reaching the 10,000 hours is just actively consuming compelling TL content whenever you’re free and would normally consume native language content (active immersion), and then listening to them once again while on your way to work or brushing your teeth or something (passive immersion). As an example for compelling content, what drew me to learn English in the first place was mostly popsci and video game content that I was really interested in and that were simply not available in Turkish. I would also recommend having smaller weekly goals instead of one gigantic goal that you are likely to stress over (like the 10,000 hours).
And the concerns you list are mainly time & motivation related, but the OP is asking if some people are literally worse at/incapable of acquiring a foreign language, which is not the case at all.
The guide I mentioned in my comment covers more topics than I could ever fit in a comment, including different types of immersion (passive and active), different types of active immersion (intensive and free flow), SRS, software, other helpful websites, techniques and much more so I would just recommend giving it a read if one decides on diving into language acquisition.