I want to contest that notion. I honestly don't think it's healthy.
Most of us aren't those kinds of geniuses that hole themselves up in their room and magically churn out hundreds of thousands of magnificent projects that showcase their impeccable mastery of their craft. Most of us are normal people with normal lives. We have families, we fall in love, we need to cook, we need to do chores, we have to pay the bills... and most of us have other hobbies besides our main craft.
I think it's important to develop those other parts of you. It came as a bit of an accident to me because I had fallen so hard in love with my boyfriend that I knew I had to shift my work schedule to be able to nurture our relationship. There would be no relationship if I spent all my time holed up in my room doing flute and YouTube stuff. I had to make time to get to know Jon, and for Jon to get to know me. I still have to do that.
And boy, has it done wonders to my entire life. Jon hasn't single-handedly "oooooooo changed my life forever, I wouldn't be the same without him, blah blah blah!" It was my desire to nurture a relationship with him that caused me to do a double-take on my life. I did it for me, and wow, I did not expect it to go like this. I wouldn't have it any other way.
I'm now able to both problem-solve and express myself so much more articulately than ever before through performance, making videos, and teaching. All this from simply developing the long-neglected facets of me.
I encourage you to do the same. If you find yourself burnt out because of your craft, think about those things that you always wished you had time to do. Make time to do them. Make them your "down time," your time away from your craft.
You'll thank yourself.