For me the voice is the most important, but making your singing believable makes a great performer.
I have a Ph.D. in cell biology. And that's really manual labor. I mean, experimental science, you do it with your hands. So it's very different. You're out there in a lab, cleaning test tubes, and it just wasn't that fascinating.
As a father now, I wouldn't do what my dad did, because it left me feeling emotionally unstable as a kid. But he didn't do the things he did out of selfishness or malice.