That is pretty cool but really, could whoever wrote that not have spent however long that took (which I'm guessing is quite long) doing something a lot more worthwhile.
This is narrow minded. The same thing could be said about most any of the great thinkers of history... specifically those in Mathematics since it's so abstract. Arguably programming like this is closer to Math than hacking industry software.
There are of course a handful of exceptions like Benjamin Franklin who tended to be pragmatic. And there is nothing wrong about only being productive in a way that is economically quantitative. But I think there should be room for both.
That's like saying to new parents - "Wow, this kid you have for yourself, that's pretty cool; but really - could you not have wasted your time with that and build a business instead?"
