Fair question. Noting that I am a Python person who has only tooled around with Rust a bit, a few packages I think warrant inclusion because the base options are too anemic:

  - Command line parsing (more feature rich the manually iterating over args)
  - (De)Compression: tar, zip, gzip, bzip2
  - CSV parser
  - Date time 
  - Hashing: md5, sha1, sha256
  - HTTP requests
  - Logging
  - Random generation: ints, floats, sampling, uuids
  - Regex
  - SQLite bindings
  - (De)serialization: json, ini, toml, yaml
  - System niceties: where is user home?, # of cpus?

Appreciating some of these are quite complex, and probably best left to a crate that has more leeway in experimentation/breaking APIs.

Edit: tried to make the formatting less bad

Maybe some of these can be chalked up to language philosophy or APIs as you said, but many of these would be welcome additions in my eyes.

I think regex, time, and crates like num_cpus would especially be nice to have. There's plenty of those types of crates where it feels like you can't compile a single project without seeing it float by as you build the dependencies.

> and crates like num_cpus

https://doc.rust-lang.org/std/thread/fn.available_parallelis... — Rust 1.59