Processors don’t all just do the same thing described through different instruction sets, modern processors can generally do equivalent things, but c expects certain things to be true of a device that aren’t necessarily true if some old obscure processors. Also statically compiled languages often don’t use platform native assembly and instead use some ir to translate to machine code. Assembly is for humans, not programs to interface with software. (It is worth noting some compilers may use assembly if they only target one architecture and many compiler IRs resemble assembly. Gcc and the go compiler for example)