I agree. But your point is not at odds with my point. Just taking a macrame class to 'learn about the outside world' is not the most efficient use of time. What I meant was (it was implied my 'with directed effort' sideline) that there are ways to learn about what you need to build from specific focus on those things. You don't have to have family picnics each Sunday to learn how to best design something for 'the outside world'. When you recognize you need to know something for the audience you're building for, you can study that specifically, you don't need the rest.

Of course it's much nicer to go on Sunday picnics and solve cognitive dissonance between 'I want a personal life' and 'I want to be the best at XYZ' by rationalizing it as 'oh but these non-specific activities will make me a more well-rounded person, which will make me better at 'XYZ'. In itself that's OK, humans need such rationalizations otherwise we'd go crazy in no time. BUT, just because we use those rationalizations, that doesn't mean we shouldn't recognize them as such.

So, after this detour ;), my point is: having a family, socializing etc. are not necessary to know what you need to know about the outside world to be the best at anything.

Some will, some won't. See my other reply in this thread, http://news.ycombinator.com/item?id=2216139 .