1. I mostly get to choose how much I work, currently around 25 hours per week.
2. Despite fewer hours, I still make more annually than I ever did working full-time.
3. I don't have waste time going to all-hands meetings, mandatory trainings, offsites, etc.
4. I can work on my own side projects without worrying about an employer trying to claim the IP.
Maybe you could argue there's less job security, but if you think you have much of that with at-will employment, you're fooling yourself.