C++17 is not released yet and the current major C++17 implementations aren't ready for production use.

C++14 doesn't have many new features. C++14 contains many fixes on minor details which was implemented even in C++11 implementation because the Standard wording of C++11 is either ambiguous, impossible to implement, considered too harmful on that fixed part.

oh i know, i was just trying to clarify the question asked.