JetBrains and C# have a long common history.
Microsoft has done a lot of work in the last years to make C# even more open than Java is today. Who has thought of this…
One very good achievement which is underrated and a bit forgotten is interactive .NET. You can have C# Jupyter notebooks and in Visual Studio Code it is possible to have Python code and C# code in even one notebook (allegedly with variable sharing- haven’t tried this).
Wouldn’t be it cool to have Kotlin and C# in one notebook in Datalore for example?