The advantage is one of trust. If the `abc` developers build well known library `abc.pqr` are well trusted then I know I can use `abc.xyz` and everything else u

The advantage is one of trust. If the `abc` developers build well known library `abc.pqr` are well trusted then I know I can use `abc.xyz` and everything else under the same namespace without (much) vetting. We could even have `rust.xyz` for crates that are decoupled from `std` but still maintained by rust core devs such as `regex`.