Is Haskell really that much more productive for a team? What are some large-scale projects written in it? It may make recruiting harder and take new joiners lon

Is Haskell really that much more productive for a team? What are some large-scale projects written in it? It may make recruiting harder and take new joiners longer to get up to speed. You may not have easy access to as many libraries. A lot of "PL enthusiast" types would rather show off how clever they are than solve real problems. There are many valid concerns a manager could have that aren't headcount-related.