I mean, probably all of them, but one thing that never sat well with me, is people calling me shy, because I wasn't talkative. Or assuming that I would have stage fright, because I wasn't talkative. Or thinking I was antisocial, because I wasn't talkative.
Like, man, I just don't have anything to say, please stop interpreting that.
Probably not going to happen. I will say that it's less bad than you might think, because there is more-or-less an unofficial extended stdlib, i.e. high-quality, widely used libraries which are maintained by people in the Rust team.
But yeah, I'm involved in a somewhat larger project and we've cracked 1000 transitive dependencies a few weeks ago, and I can tell you for free that I don't personally know the maintainers of all of those.
If this was more of a security-critical project, there's probably a dozen or so direct dependencies that we would have implemented ourselves instead.