Unlike in Go, the standard library in Rust is very minimal and does only provide the most basic functionality. As an example, to generate random numbers we have to use the rand crate.
Rust’s core and the standard library are intentionally minimal; batteries are not included. Rustaceans are instead encouraged to add libraries, called crates, to the language by sharing them on crates.io.
Rust has a philosophy to be very community driven, and this is one of the results of that philosophy. On the other hand, the friction to create and publish a new crate is quite low, so the whole ecosystem is pushed on that direction.
This results in a lot of crates, and many that solve the same problem. In Rust we don’t have the uniformity of packages that Elixir has, but it’s also not as bad as the JavaScript ecosystem.