Not that I am really qualified to comment on these things, since I don't program in Rust, Go or FORTRAN, but AFAIK the one thing that is often claimed to preven

Not that I am really qualified to comment on these things, since I don't program in Rust, Go or FORTRAN, but AFAIK the one thing that is often claimed to prevent languages reaching C/C++ performance levels is garbage collection, which Rust doesn't have (but Go does). As we all know benchmarks need to be taken with a handful of salt since the publisher often has a vested interest in pushing one point of view or another for monetary or whatever reasons. My personal view is that until we see a AAA game engine or mainstream operating system that is able to run a comparable suite of software to Windows/Linux written in Rust or Go, we won't really know if these languages (or implementations thereof) are going to be suitable for these things.