A jit can tune itself to properties of input data which were unknown at compile time. That's a serious advantage for long running programs that don't know much

A jit can tune itself to properties of input data which were unknown at compile time. That's a serious advantage for long running programs that don't know much about their input, which might be the important ones. That might still be the realm of the sufficiently smart compiler though, aka vapourware, so in practice today you're probably right.