Unfortunately a bit late :) Highway reached v1.0 about 2.5 years ago. How long would it take until Clang/GCC/MSVC are ready, and all users' distros have updated? Not to mention that the number of ops provided by std::experimental::simd is extremely limited - basically only math operators, and zero support for shuffling/crypto/rounding/interleaving/table lookups which seem indispensable for many applications.