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Half these things take under a few days to learn sufficiently for any business with ARR under ~$1M.And publishers used to sell "TEACH YOURSELF C++ IN 21 DAYS". Doesn't make it so.
> And there's no MBA program that will teach you strategies that are especially useful in reaching customers
There are courses about exactly and entirely this.
> if there was a professor who really could teach that, (s)he'd be monetizing that skillset instead.
A lot of business professors are independently wealthy from side businesses. Karl Ulrich springs to mind as a serial entrepreneur, teaching at Wharton.
> There is potentially tremendous value for someone looking to have a career in business at larger companies.
This is true for some MBAs or, rather, some course designs. But there's no law that professors at business schools can't study, themselves experience and teach entrepreneurship. Because they do. The faculty at Wharton or Stanford have honest-to-goodness entrepreneurs because they want to be there.
It's one thing to say that teaching is an imperfect substitute for doing. It's another thing to say that there's some mystical essence that business schools are somehow magically blind to and stoically opposed to learning about, studying, experimenting with and teaching.