I write F# and Scala (among other various languages). Unfortunately I have to own Rider and Intellij to do all of those things in the JetBrains ecosystem :\
I too have run into this recently at work. IntelliJ for Rust, Dart, JS/TS, PHP etc but I break out Rider for C#. Would be a dream if one day these were combined so IntelliJ would be a true polygot IDE