Why not C-Sharp?

Because Unreal Engine doesn't ship with C-Sharp support.

There

was a plug-in for a while, but they didn't support everything.

No, and also I think kind of C-Sharp and Lua and Python and the ones with the integrated garbage collectors are kind of a bad idea because then you have, first off, you need to take care of Unreal Engine's garbage collector and please that one.

And then anything you write in the scripting language, you need to have another garbage collector, so that's like garbage on garbage.

I prefer cake on cake.

Yeah.