Introducing complexity into the build system, error messages, my mental model, interoperation between different parts of the code, other developers are often un

Introducing complexity into the build system, error messages, my mental model, interoperation between different parts of the code, other developers are often unfamiliar with less popular parts of the language, modern stuff especially sucks for portability between compilers and OSes. That's just my experience of course, and it doesn't mean I don't profit from writing and selling cpp-based software every day.