Most high performance code is vectorized and Rust is better at autovectorization and aliasing analysis than C++, so I'm not really seeing your point.
Having to drop down to intrinsics early is not a strength.
Having to drop down to intrinsics early is not a strength.
My biased opinion, from doing this full-time in C++, is that the C++ SIMD story is much further along, especially regarding mature libraries.