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As opposed to actually spending their time building useful practical things?

Yes, that's why I manually input 1s and 0s - no time wasted on learning, only outputting practical things.

I hope you don't live every second of your life building useful practical things.

I do actually. What else are you supposed to do with your time? Life is short, best to use it.

I'd say commenting on Hackernews isn't building something, let alone something useful. So that's at least one thing you do that's not that.

Everyone needs a break from time to time. :P