Most Google Employees Can't Separate Work From Their Personal Life

It just takes discipline. I'm not a google employee, but I run an online business entirely on my own (and have been doing so for 15 years). I simply don't reply to work emails after 6pm, and don't check my email much after that time either. (If I do check my email, it's more to check for personal emails).

The only possible urgent thing is if my server goes down. However I get a text message if that happens, so I don't need to keep checking my email.

You're not doing yourself any favours by answering emails all night. You will be much more productive if you relax or do something other than work after 5 or 6pm. I also take naps during the day, walk my dog twice a day and/or watch MASH and other TV shows in the afternoon. If you looked in on me you would think I was a lazy bastard, but in fact I'm more productive than any other developer I've ever met.

"In order to address this, Google's Dublin office has a program called "Google Goes Dark,"in which people have to leave their devices at the front desk before leaving for the night."

Come on Dublin, a front desk full of brains will attract, if not create, zombies.

Is it possible that there is selection bias at play hear? Are people who are more likely to be integrators also more likely to apply to work at Google?

How about tech in general? My general feeling is that in most companies where the core business is tech, many of the employees are integrators to a degree much greater than the average person. Many engineers at tech-focused companies are likely to code outside of work for fun, and it's likely that they code on stuff either directly or indirectly related to the code they produce for their employer.

Is this even news? What's the ratio of software developers in general or at least at similar companies?