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The merits of functional programming techniques are a lot more interesting than the languages that implement them, "pure" or not. Closures, first class functions, and list comprehensions are interesting topics of discussion. Java vs. Haskell not-so-much.

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Java vs. Haskell not-so-much.

But it's mostly in such comparisons that "closures" and "first-class functions" are brought up.

If you check out /r/haskell you'd be hard pressed to find those terms.

I hardly ever think of closures qua closures; they are a language implementation detail that's at a level barely above assembly.

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