Further, independent work can serve as a form oftraining ground for getting the basics right of going out on yourown, and is often an incubator for many independents to become even larger-impact entrepreneurs.
When we advocating you prepare yourself for the next job, we are assuming you will be doing it on yourown time (unless your company has some ongoing training program they want you to be a part of.) And when we say, if you are unfulfilled at work you should find something fulfilling outside of it, we mean exactly that.