It’s a well founded rant because most people employed to write software cannot program, communicate at an adult level, or follow simple instructions. The comments here unintentionally qualify this assessment.

> The comments here unintentionally qualify this assessment.

Which comments might those be? Be concrete.

You also didn't give any example as I asked, you are happy just generalizing so it's not really interesting to engage with you, is what I am finding.

which of the three pillars you list above does this statement fall under?

Evidence. Its demonstrable, provable, and quantifiable. It's also why interviewing is so bad.