I think it's a question of inertia, people and organizations do things the way they have been doing them for some time. It has worked so far since the business

I think it's a question of inertia, people and organizations do things the way they have been doing them for some time. It has worked so far since the business is still up and running, so why take a risk and change. Choosing a not widely adopted solution even if it would be somewhat better than others is always a risk. Also it's not a question of whether to Haskell or not. There are many more choices, each with their pros and cons. It's a bit like with religions, why should I pick just one :-)