of course it is very convenient, you dispose of your personal free time, work as much time a day as you see fit, you can make a day off any day,and most importantly-you are your own boss
about the fact that freelancers have more free time, I doubt very much... many people I know the guys who work on themselves - they work 25 hours a day.
You say that these people have super abilities !! Miracle people just !!! Well, no such!
It is clear that 25 hours is an allegory. Its just that people who receive an order and work on piece-rate payment for a job specifically done are valued by orders and try to do everything as quickly and efficiently as possible. Therefore, they work almost around the clock.