Earlier quoted context omitted.
”Exactly my point. It shouldn't be necessary to spend all that time futzing with tools, the tools should be there, ready to use.” It isn’t necessary. The tools are fine, and/or improving them won’t solve the fundamental problem. People are just procrastinating. ”Online availability does not scale. These are precisely the issues that digital tools should be good at addressing, but have failed to do so.” Short of makin…
If that is true, then not only digital tools, but all books, classes, tests and every other technique aside from what you recommend for language learning are fraudulent wastes of time.
When you're speaking your native language, you're decoding and processing complex social signals in real time at multiple levels of structure (phonological, morphological, syntactic, semantic, pragmatic). Even the best AIs can only get a couple of these levels of structure, with significant error rates, and only in a handful of well-studied languages (there are hundreds or thousands of natural languages). How much time does it take for you to learn 1000 vocabulary words? A natural language will have tens of thousands. A comprehensive grammar of the English language would be dozens of heady volumes and have less information about English grammar than any competent native speaker.
Learning a language is just an astonishingly huge task. No course or system can cover it all. Mostly they're just trying to make things easier for you.