I’d push back on this idea, and instead say that some people learn really well from the current tools, and some people can’t.

99.99% of the population picked up their mother tongue just like everybody else. Naturally there are differences in the population, but I would posit that if you learned a language once (or twice or three times - I know trilingual people who insist they can’t learn a foreign language because they failed Duolingo Spanish) you can learn a language again.

My bias is that I’m working on an alternative language learning tool now - one aimed at ‘language acquisition’ over ‘language learning’, or basically how can you learn a language by just talking/listening to native speakers. Aimed at those who have finished traditional courses and want to master a language, or those who have tried traditional courses and find it didn’t mentally agree with them.