It would be hard to overemphasize the importance of work-life balance. It's equally hard, though, to say what it is, because it's different for every person. I think you just need to keep it in mind and make sure you're doing things that make you happy.
Maybe these responses are unfair. I do think the tone of your article -- and many similar articles -- imply a sort of single-minded focus on building your business that a lot of people associate with poor work-life balance.
