A huge portion of the Go standard library is extremely low quality as well. flag, container, image, json, log, much of math, path, regexp, sync and time are all notoriously low quality and will almost certainly get improved versions similar to encoding/json/v2. The container package alone has to be the worst package included with any major programming language in history. The standard library in general is also riddled with abstractions that don't hold across the various platforms that they claim to support. path and os are particularly awful in this regard.

Also if you go look at any real Go projects they usually use tons of dependencies and they're usually pinned to random git hashes which is its own massive problem.