This was actually the main thing that put me off of Rust. I get the argument for a small std lib. I just also don’t agree it’s worth it. Go seems to handle having a batteries included standard lib just fine.
On the other hand, there are some bad Go standard libraries that are frozen in time.
People confuse what they want.
They do not want a big stdlib. The downsides are real (the stdlib cannot make breaking changes), and there are no upsides (except, maybe, for faster compilation, since std comes precompiled).
They want more official crates (e.g. `regex` and `libc` are official crates, maintained by the Rust project). And the Rust project does not oppose to that, it just doesn't have the funding.