I use Haskell at work. At my current job it’s my teams primary language, and almost all code we write is in Haskell. I’ve been using Haskell at work for years now, but more often as a secondary or tertiary language along side others.

Haskell, and FP generally, work well for everyday industrial programming. In my experience I’ve never found there to be an issue that was a dealbreaker- although there are tradeoffs.

That said, whenever I’ve looked for work I’ve always looked at non-FP roles in addition to FP roles because there are just fewer FP jobs out there.

Another classic FP talk is Rich Hickey’s Simple Made Easy. I think he does a great job of talking about the differences between things that are simple, and things that are merely easy.