C# indeed gets more and more features known to F#, like pattern matching, switch expressions, records, a way to deal with nulls, and someday maybe even discriminate unions and deep equality on collections. Maybe even type inference could become as powerful as in F#. However, C# can’t eliminate the features it already has, like mutability by default and statements. Immutability by default and expressions-only are strengths of F# and make building error-free apps easier. Real pipes and...