Haskell is a poor language to be doing mathematics in.
I’d say the majority of people working GHC are software developers and CS researchers. They’re a friendly bunch.
What’s holding back tooling is that the developers of the de-facto compiler for Haskell are spread out amongst several organizations and there isn’t tens of millions of dollars funding their efforts. It’s mostly run by volunteers. And not the volume of “volunteers” you get on GCC or the like either.
That makes GHC and Haskell quite impressive in my books.
There are other factors of course but the tooling is improving bit by bit.
The whole “Haskell is for research” meme needs to go into the dustbin.