The problem is that many good people are just as confident and stubborn about subjects they know nothing of as about subjects they know a lot about. Sure, having a company full of people who know themselves is the best answer, but that's hard. your field is much wider if you can deal with arrogance.

I have had the problem of good technical people asking me to rewrite my business plan.

One way of dealing with that kind of arrogance is to have upper management that lets each person make the decisions they know the most about. It requires good management, but it means that you can hire people who do not modify their confidence level based on their experience.