But when you look what all that C++ is doing in Base, it seems like it's basically LLVM and then a lot of code that's just there to help you write more C++ code

But when you look what all that C++ is doing in Base, it seems like it's basically LLVM and then a lot of code that's just there to help you write more C++ code. Not a whole lot of the FreeBSD Base userspace, the uilities and so on - is actually written in C++ despite that. It's getting a free ride because the compiler uses it.