> For example Intel's C++ compiler produces (or used to produce?) much more efficient numerical code than either gcc or clang. I'm not an expert, but I believe

> For example Intel's C++ compiler produces (or used to produce?) much more efficient numerical code than either gcc or clang. I'm not an expert, but I believe that Intel could have implemented their hardware-specific optimizations in any other compiler framework (either gcc or clang). In this case multiple language implementations, while commercially viable, are not beneficial to all users.