Granted, these applications do exist. They are simply becoming more and more rare. I'd also say that there's been a pretty steady dedicated effort to abstracting the assembly. It's still pretty low level, as in you are caring about the specific instructions being used, but it's also not quite assembly in both C++/rust.
Java, interestingly enough, is somewhat leading the way here with their Vector API. I think they actually have one of the better setups for allowing someone to write fast code that is platform independent.
C++ is also diving into this realm. 26 just merged in now SIMD instructions.
That is the bulk of the benefit of diving down into assembly.
https://en.cppreference.com/w/cpp/numeric/simd.html
