People are building those things in Go and Rust because they're currently implemented in unsafe languages like C/C++ and are therefore riddled with undiscovered

People are building those things in Go and Rust because they're currently implemented in unsafe languages like C/C++ and are therefore riddled with undiscovered memory management bugs, overflow bugs, undefined behavior etc, which are often security vulnerabilities waiting to be exploited. I don't think it's reinvention for reinvention's sake, I think they're genuinely trying to fix some of the horrible historical mistakes of C.