There's an argument to be made that F#'s place in the .NET ecosystem is to be a feature sandbox for C#. When F# first dropped, I was instantly in love. It was

There's an argument to be made that F#'s place in the .NET ecosystem is to be a feature sandbox for C#. When F# first dropped, I was instantly in love. It was just so much nicer than C#, which was already nice. But, in the intervening years, C# has been adding new features at such a steady clip that it's hard for me to have such strong feelings anymore. Stylistically I like to have algebraic types and pattern matching, but from a practical perspective I think the two languages probably offer about the same level of productivity.