See "The E-Myth Principle is Still Alive and Flourishing" at https://www.forbes.com/sites/martinzwilling/2013/04/25/the-e...
"The E-Myth ('Entrepreneurial Myth') is the mistaken belief that most businesses are started by people with tangible business skills, when in fact most are started by 'technicians' who know nothing about running a business. Hence most fail...Let me assure you that in my experience, ...I still see too many businesses started by technicians who haven’t acquired the basic skills or knowledge, or still assume that business acumen is a minor part of the new business equation."