The std libraries in rust are sufficient for most things, but it’s definitely true there are very rich crates for networking with higher level semantics or specialized abilities (for instance async networking is generally done by bringing in tokio or something similar). In rust this isn’t considered bad, and in a lot of situations like embedded systems you don’t want or can’t use std because (for example) posix semantics aren’t available.

Personally I’m not a fan of batteries included languages because they inevitably suffer a Python heat death if standard libraries as the ecosystem improves faster without the baggage standard libraries carry intrinsically.

Hence, IMO the fact std provides a highly common and simple layer and external crates provide opinionated ergonomic interfaces is a feature, not a flaw, of rust. The crate ecosystem in rust is exceptionally good.