C++11 is a theoretical language developed by a committee which doesn't really exist in practice.
That gcc, like most other C++ compilers, does not support it, means little.
That gcc, like most other C++ compilers, does not support it, means little.
The notion that C++11 doesn't exist is novel given that I'm using it regularly on both platforms that I consider relevant.
The answer is that languages are hugely important. C++11 is an entirely huge language and having a standards and feature compliant compiler is critical to being productive in the language.
Last time I checked C++11 has been an ISO standard since last August, with MS and Clang ramping up their support for it.