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If I'm a manager, and somebody tells me that the development team wont be productive for months, I'd likely ask for some real metric indicating that Haskell solves / eliminates classes of bugs untouched by other statically typed language.

At least some figure indicating that a Haskell app is less prone to bugs, etc.

Otherwise why not throw Typescript at it?

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I'd probably rephrase "not" to "less". Haskell is sufficiently unlike other languages that a lot of knowledge/skills that are usually transferable between languages don't apply to it. That means you need to (re-)learn how to solve those problems in Haskell if you want to use it.

The end result is _usually_ better (e.g. Lenses are in almost all cases an improvement over getters and setters; Functors, Monads and Traversable are an improvement over imperative control flow), but damn it it doesn't take a while to get your head around those concepts.

yeah it sounds like it. One day I’ll actually dive in and learn that stuff.

The "not productive for months" is a exaggeration.

Even non-trivial type-level programming can be picked up by complete novice in Haskell in less than month. I experimented with that.

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