[dodecaphonic]

Exercises in style do not make books (Raymond Queneau nonwithstanding). If you just try out a load of languages, learning what's possible but not doing anything with it, what's the point?

I don't think he is discouraging learning new stuff, looking at new techniques. What he is saying is that a solipsistic attitude about programming is a waste, and that resonates with me. I've seen many a time people who can make awesome demos of SLIME, have Haskell tricks up their sleeve, write languages on weekends, and yet ultimately do absolutely nothing. It's scholarly, for sure, but that's it.

To be fair, I agree that there's explorations to be done in this realm, but the sorts of explorations that create value on a visible scale tend to go hand in hand with some application. "ERLANG'S SO AWESOME" because its ingenuity meets reality quite rapidly, and you can build stuff with it. In a societal scale, that's the true value.