My thoughts on being a Jane / Jack of all trades is from the perspective of being one.
I find it exceptionally hard to describe what I do to someone who asks. People are so used to "pigeonholing" that someone without a neatly defined title seems to confound them.
As far as personal job-satisfaction, my versatility has helped me enjoy just about anything I choose to do. It also, combined with a discomfort in negotiating, often lead to me taking on more work without more pay, when I worked for other people.
As for my "career of projects" that I have now, being a "Creative Jane" fits perfectly.