In the latest Unity version (2018) you have access to C# 6 (stable) and .NET 4.6.
Python as a scripting language makes sense, in this arena, anyways, as it's the scripting language for Blender. A single scripting language for 3D software and game engine in a game studio just makes sense.
I can go for a coffee when Blender does some kind of data transformation, I can't do that in a middle of a rendering a frame 60 times per second.