Or not even about "work life balance." Some of us like what we are do and are good at it, and don't want to move up.
6.3 "I exist so that I can program. If I were promoted, I would do nothing but waste everyone's time. Can I go now? I have a program that I am working on."
I was quite content being a software engineer and at most software lead, left alone to design and implement solutions with a lot of independence. Making me team lead or more and sticking me in meetings and having me do paper work would have been a waste of my skills and experience. The one time I did think about becoming a manager type, my boss, who was moving up one position, said he'd rather me stay where I was, doing actual work, then bumped my salary to $1k less than the person who replaced him.