Earlier quoted context omitted.
That seems like an extremely inefficient way of learning a language, and does not match at all my experience nor the experience of the people I know fluent in multiple languages, and it seems to go straight against a common advice which is to speak and practice early and often, as 'producing' language is much more efficient to learn it than 'consuming' it. What makes you think 15000 hours of listening would improve a…
This is a common misconception. It probably does not match your and others' experience simply because it is conventional wisdom, and most people are taught to do this. But just because most people do something a certain way does not make it the most efficient way. There are a number of reasons why you would want to focus on input early on. For starters, with very little exposure to a language, you have very little id…
I'm unconvinced to be honest, as pretty much everything else that human learn is made better by practice, but I'm not a linguist.
I still think that proposing to start learning a language by spending 15000 hours (or 1500, or 150) listening to it, instead of trying to practice early on is a very inefficient way to learn a language, compared to pretty much anything