As someone who has done some dev in F# professionally I think a lot of the comments above could come from trying to use F# like C#. WPF (and in general older .N

As someone who has done some dev in F# professionally I think a lot of the comments above could come from trying to use F# like C#. WPF (and in general older .NET Microsoft frameworks) is probably one of the worst cases for F# however; the framework is designed pretty much exclusively for C# usage (i.e. PropertyChangedEventHandlers, generated C# classes from XAML, etc). From a functional language perspective there's different ways of solving the above problems. While you could code WPF in F# it's clunky and doesn't pass the cost/benefit test IMO in its current state; you would be coding in C# style with just a different syntax since the framework enforces a given coding style. Performance wise I find it depends on what your doing. I've had nicer code run faster in F# than C# with inlining and such. You can resort to mutable coding if you have to in F# as well so I don't think its truly the case. If your using immutable data structures and writing a WPF app on top without understanding them I can see why you would get the performance hit as an example. I haven't had a problem with Intellisense, IDE niceness (e.g. Rider, VS Code), Go To Refs seem to even work in VS Code etc. All the Resharper goodies aren't there; but after awhile you find you just don't need them as much in a more leaner language.