I'd reckon a vast majority of people have not, and some major subset of those don't want to; why do you say this like it's bad? People opine about things they don't have firsthand experience in all the time.
It’s an ad hominem attack: Richard here asserts the author is incompetent, instead of putting forth an actual counter argument. It’s lazy at best.
As somebody who has run a company, I actually agree fully with it.
Would it be alright with you if an economist weighed in on the Fed’s decision to hold interest rates, or are they not qualified to do so because they’ve never sat on the Fed’s board of governors?