Language learning software is broken in terms of reaching its ‘holy grail.’ I believe the holy grail of language learning is the ability to learn a language outside the country that speaks it, to a level of fluency that puts the user within 30 to 45 days of advanced reading, speaking, and vocal comprehension fluency once they are in the country.
This is a problem worth solving. I read somewhere recently(if you find a link please message me) that the demand to learn English is so great in China that if they hired every US college student to teach English, they would not fulfill the demand.
There are some fundamental reasons why many of these software platforms fail at the attempt to reach the holy grail.