Most people have an idea of what they would ideally do if given unlimited amounts of time. The reality is, in my experience, that most people cannot put the same level of work, focus, and dedication into their own projects that they can into the projects an employer pays them to work on.

For whatever reason, most people need the structure, constraint, judgment, or whatever that an external authority imposes on them. Having the skill and motivation is not enough to bring your highest work to your own purposes. There is a second discipline that involves self-accountability, which runs orthogonal to capacity for the work.