Also, since my stated goals were to work less and take more vacation, the flexibility advantages you mention for an employer are precisely the flexibility advantages for ME that I was looking for! I love the ability to, every 4-8 weeks when a contract is done, decide how long to take off before the next one if I'd like to, or decide which project to pursue next.
I don't want to be sitting bored in an office getting paid because they bought my time "in bulk", like I've done before. If you find that an enjoyable way to spend your finite amount of time alive, that's honestly great as you'll likely face less obstacles, but it wasn't for me.