[M8]

It's not subjective. JS is only relevant due to ubiquity. Nobody transpiles to C#. (well, except for Haxe - to nitpick, but it also transpiles to Java and C++).

[Nullabillity]

Because people compile directly to CIR. See: VB.net, F#, Scala.net, IronPython, IronRuby, etc.

[M8]

I meant C# is awesome so you just use it directly :).