What is wrong with focusing on what you find interesting and doing only what is really necessary of what you do not? The problem is forcing everyone, regardless of talents or interests or aims, to follow the same curriculum
If you know its useful you are still motived. if you are motivated overall you will develop the discipline to get through what you do not find interesting and put the work in. it avoids situations like this from the first comment in this thread: "they would simply never study or do the homework I assigned them, and then they would do terrible on tests and I'd be stuck having to give them a bad grade."
this is exactly how you create a population that is mathematically illiterate and ripe for manipulation by foreign powers and marketing agencies.
Our society and any democracy relies on a shared minimum level of competence. If you cannot compare costs per unit, do not understand basic biology, or cannot compare evidence, just because it does not interest you, you are cannot function in modern society.
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