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…except, of course, it's proven that having a thoroughly diverse educational foundation is much more valuable by any measure

The goal of education is to teach critical thinking skill so as to be able to learn how to learn.

It's not to turn out one-track drones with no understanding of the diverse reality around them

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Employers of all kinds prefer hiring well rounded educated individuals.  They prefer the creative minds cultivated through a diverse education.
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If that fisherman has a basic understanding of trigonometry he's going to better understand the physical laws that control the angles involved in the setting of his gear.

If more people had a good understanding of Shakespeare, the world would be a much better place.

"And thus I clothe my naked villany 
With odd old ends stol'n out of holy writ, 
And seem a saint, 
when most I play the devil."

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There's no substitute for an immersive, fully integrated diverse and multi-faceted education.
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We need more of that, not less.