There isn't just a single axis for developers. A developer who knows the details of C++ may just be (or possibly, probably) a language lawyer. That doesn't me

There isn't just a single axis for developers. A developer who knows the details of C++ may just be (or possibly, probably) a language lawyer. That doesn't mean they know much about how to put out readable, maintainable, performant, simple code in a reasonable time frame. One could argue that many developers know better than taking the productivity hit of C++. Disclaimer: I do C++ as my day job, and my MS thesis was in metaprogramming. I still think C++ usually doesn't apply, even though in some important cases, it very much does.