I blame Michael Gerber. In his seminal book, The E-Myth Revisited, he embedded the idea “You need to work on your business, not in your business,” into the hearts and minds of millions of entrepreneurs. Since then it’s become a standard in speeches and articles from consultants and advisors of all shapes and sizes. It's become a mantra for many. Before anyone goes off the rails, please know that I am not saying that executives need to stop working on their businesses (and, yes, the vast...