[sickbeard]

Asking businesses to rewrite apps in a different language is a non-starter. It adds no value. The app is already there, written in c#. Why rewrite it in f#?

There has to be some reason to write something in F#, usually the reason is functional programming, which excels in manipulating data. However most programs rarely manipulate data. They show a UI, get some input from a user or server, save, retrieve, re-display in a different form. These kinds of programs work very well when written in imperative languages compared to functional ones.