> Disagree 100%. Some of the best developers I've met understand very well how to separate their work. The stereotypical hacker that works all through the night on obscure problems tend to pidgenhole themselves and lose sight of the purpose of programming. They also tend to be the ones that burn out to epic proportions. It's a very unhealthy mindset to have, and to be encouraging others to have.

Yes.

I'd add: anyone smart enough to be considered an expert in any subject will eventually find other subjects to explore. I'd argue this helps them become a better developer, more than coding in their spare time ever would.