[account42]

> Take something as "simple" as operator overloading. If a beginner does a "5"+5, the compiler is forced to respond with "no operator + for the types given, types are: int, std::string" instead of the infinitely more friendly "can't add string to int".

You are not allowed to overload operators involving only built-in types so operator overloading changes nothing about the expression "5"+5. Even if you could overload operator+ here, there is nothing preventing a compiler from giving you the friendly explanation if that operator does not exist (perhaps with an additional hint that it could be defined).

(Also, the expression "5"+5 is valid C++ but Clang has -Wstring-plus-int to warn you that it might not do what you expect.)