> I've seen buggy pre-1.0 libraries used for critical production softwareNot "critical" as in "if it goes down it's really annoying", but "critical" as in "checks and stores passwords" or "moves money from one bank account to another". simply because it was a wrapper library written in a functional language, as opposed to a more stable library written in an imperative language.

I do think if you're using a niche language in an industrial capacity, you need to know how to work with libraries outside the language. Admittedly this is easier for some languages than others. But I've run into candidates who wanted to interview in clojure but who didn't know how to call into pre-provided java libraries.

A lot of technically minded people do not have the self-awareness to answer that question honestly even to themselves.