I feel that Haskell is a bit of a different case though. Like Lisp and Forth, people use Haskell because they are attracted to something at the core of the lang

I feel that Haskell is a bit of a different case though. Like Lisp and Forth, people use Haskell because they are attracted to something at the core of the language itself which no mainstream language has. It’s like the same reason people learn Lojban as a spoken language. For languages that are trying to be actual deployable systems programming compilers in widespread use, that intrinsic motivation doesn’t seem to be there I think.