It sounds more like self-employment is more of a means to an end than an end in itself. When the end is happiness, flexibility and a feeling of wanting to work, that can be also be achieved through regular employment.
I spent the last three years self-employed. I didn’t overly enjoy my freelancing work (business consultancy for companies wanting to invest in China) but it made good money and allowed me to start working my way towards a career in academia. Without self-employment, academia is fairly inaccessible to people from my background. Thanks to my freelancing work, however, I’ve managed to get to the stage where what I want to do (study, research, write) is finally feasible.