> Given that, Haskell, unless you're a mathematician, is still one of the least accessible language outside of purely academic, esoteric or intentionally obfuscated ones.

Tiny nitpick: Haskell the language and runtime is just another ML. You could technically write a ground-up Haskell program that doesn't do any maths stuff — in about the same way that you can write a ground-up Erlang program that doesn't use OTP.

Haskell just has a standard library and language-package ecosystem that's full of stuff only mathematicians were previously expected to understand. :)