I don't think that Erik's point was that using just one language made
him narrow minded. His main problem is not able to figure out in which
domain a problem lies. Knowing more languages than just Perl doesn't
solve the problem of determining whether a solution needs to be searched
in the language, the protocol, the system, the hardware or something else.
It's good to broaden your horizon, but I don't give to much weigth to
knowing lots of languages. Small domain languages can be useful, but
the added value of knowing more general purpose languages rapidly