There is a gap between the knowledge they live by and the knowledge they use in debates. The knowledge applied to debates is what they call ivory tower abstractions, and the knowledge applied to life they call pragmatic.
This gap is a very very bad thing.
This separation results in lots of bad intellectual ideas that contradict reality. And lots of bad life choices that contradict principles and logic, e.g. by being superstitious.
Being able to speak intelligently about your life knowledge allows for getting advice and learning from criticism. Being able to apply abstract knowledge to life allows for using the scientific method, free trade, or successfully finding a book in a Dewey Decimal organized library.