The huge fail is not there.
The huge fail is that people don’t realize how easy it is nowadays for one to develop his own programming language and as a result of how easy it is to extend an existing one. There are thousands of programming languages that technically “nobody uses” yet they make 50% of the code that exists out there.
That’s how C++ started as an extension of the C syntax.
While C# and .NET is the brainchild of the creator of Delphi back when Borland was still a company.
Both languages have been based on existing code bases and heavily borrowed from them at least concepts and ideas that tried to take them further.
You want C# in Unreal, none is stopping you, stop complaining do something about it. You want C++ as easy as C# stop complaining, fix the terribly bloated syntax. Bottom line is that one can talk about it or do something about it. Talking about it produces nothing of value. Including this post.