There are a lot of places where interop sucks. Other than the ones already mentioned by someone else in a previous comment there are the events that need a lot

There are a lot of places where interop sucks. Other than the ones already mentioned by someone else in a previous comment there are the events that need a lot of ceremony in F# to be compatible with C#, lack of implicit conversion that in some cases renders some C# libraries unusable unless you define some explicit conversion operator and probably some other stuff that now I don’t remember. If you can work only in F# it’s a much better experience compared to mixing C# and F#.