> Haskell is perfectly viable if you want to hire a team of junior and mid level developers

Looking beyond permanent hires-

In my python-based startup, we routinely offload work to contractors on an as-needed basis. Having a flexible staffing level saves us real dollars, and staffing flexibility delivers products to customers faster, which generates revenue dollars faster. From a financial perspective, our staffing flexibility delivers real, measurable economic gains.

Non-mainstream tools like Haskell break that model, effectively incurring an economic cost. Sure there are Haskell contractors, but their numbers are minuscule compared to python contractors. Given the enormous pool of python contractors, we cherry pick the very best who understand our business, our tech stack, and our work culture.