The difference between having something in the standard library vs shipping it as a crate is evolution not vetting, you can have the same people develop/vet a t

The difference between having something in the standard library vs shipping it as a crate is evolution not vetting, you can have the same people develop/vet a third party crate the same as it would be if it was a part of the standard library. The big difference is versioning (eg. you can have a crate that works on old compilers/stdlib, you can pull an older package version to new compiler/stdlib) and maintenance burden.