I learned Haskell in 2001, was super excited by it but there wasn’t the “day to day” stuff to get things done that you had in Java or C++. So for practical work I felt I couldn’t use it. Fast forward now, with the rise of open source sand devs volunteering to code in their free time, we have Haskell kind of useful. Definitely for web software and backend. Although I question desktop development in Haskell.