No, he kind of did answer it. "General purpose code". He didn't say "it's for web programming" or "it's for hard real time" or "it's for numeric analysis". I mean, you can probably write web programs in Haskell, but if that's what you're trying to do, you might reach for something else. Same for numerical analysis. For hard real time you would almost certainly reach for something else. But if your program doesn't fit in a "use something specialized" category, and you want to write in a functional style, then consider Haskell. That seems to me to be a perfectly reasonable answer.

And the rest of the answer is, essentially, "beyond that, if you want to see, you're going to have to learn it". I also don't find that unreasonable - there's only so much you can explain to someone who doesn't know the language. And that's not just Haskell, that's any language. I kind of have an idea of what Rust is about, but if I want to really understand it, I'm going to have to learn it. Same with Haskell, or Lisp, or pretty much anything.

So I found the_af's answer to be quite helpful. And I'm the guy who asked the question, so...