Because there is excellent tooling for C++, while they had to reinvent all the tools from scratch for UnrealScript. I believe that ReSharper C++ alone makes me

Because there is excellent tooling for C++, while they had to reinvent all the tools from scratch for UnrealScript. I believe that ReSharper C++ alone makes me 10-20% more productive. Their refactorings and inferred constants are amazing and produce real-world performance benefits. Plus having const wherever it is warranted makes code easier to read and easier to debug.