But then one got to wonder why not spend that time learning in the wild. People have forgotten how it works I suppose. It would take less energy.
There are a few options to learn a language. Some say immersion. What's most effective for the brain to capture and memories is _needs_.
We tend to learn languages out of a desire to add them to our skill belt. Or out of fun. And we are having a hell of a time this way. Duolingo innovates and will happily monetize their effort.
Learn a language? Move to the country where it's spoken. Get a job where interactions are a necessity, but where one would perform to some level without even the basics. Think kitchen porter in a buzzing restaurant. 6 months later you are fluent, and have actually learnt local expressions and the way people actually communicate. From there you can read books and ramp up your vocab to proper fluency.
I took English, by force, for 12y , 4h per week. I could still barely read, and in no way get a face to face conversation even started other than hello, what time is it.
Months in an environment where communication was a need, and suddenly I found myself nearly fluent. Never having to open a grammar manual or do extra effort for the sake of learning.
The teaching models are flawed. They are designed to extract a profit, at the detriment of the learners.