i mean yeah, but there could also be unknown vulnerabilites in the rust implementation, it's a fact of how software works. maybe even a bigger chance than there being some in the c implementation that's been around for ages and that the majority of software uses under the hood.
what i could expect out of the situation is some scripts breaking since they expect the usual gnu implementation but instead get the rust one, something similar you can see when running scripts on embedded/mobile devices with non-gnu implementations.
even if they do eventually achieve complete feature parity i don't see much benefit for that effort since the implementation can either be equal or worse. but they're doing it anyway because we need to make it into rust, for some reason.
