I also disagree, first off rand is working on simplifying it. Plus out of those dependencies it's hard to see something I'd rather do myself than trust other people with.

Windows-sys is necessary for w Windows OS kernel, libc is similar thing for *Nix, cfg-if is necessary for specializing targets per OS, arch, or SIMD capabilities.

Biggest offender is honestly zerocopy-derive. Which pulls in most dependencies.