The main reason was that team had more experience with F#. I think it is also more approachable than Haskell for OOP devs (C# to F# comparisons are quite common

The main reason was that team had more experience with F#. I think it is also more approachable than Haskell for OOP devs (C# to F# comparisons are quite common on the internet). I'm sure Haskell would also have been an excellent choice though :)