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Astra, I do take your point, however not everything (in fact a great deal) of what we learn in school is not required to be productive. Chemistry and physics have offered me very little. Advanced mathematics too. There's no reason to apply special rules to languages that mean they must be useful.
You could make a reasonable argument that children should focus more on literacy and numeracy in school, basic sciences and then move on to business or craft orientated learning, only moving on to advanced mathematics, languages, specific sciences etc if they chose to specialise in it.
Ultimately though I think the process of learning is beneficial in itself.
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