Nim's stdlib is actually quite large (like 300 modules). I am sure there are things in Go's that are not in Nim's (like Go's `big`), but I am equally sure there are things in Nim's that are not in Go's (like Nim's `critbits`, `pegs`, etc).
I doubt there is much in Go's stdlib not available in Nim's nimble package system, but OTOH, I am also sure the Go ecosystem is far more vast. I just didn't want people left with the impression Nim's stdlib is as small as Zig's which it is definitely not. Nim has web server/client things and ftp/smtp clients, json and SQL parsers, etc.
Personally, I find Swift to be a really great language, but can't deal with the Apple eco-system, XCode, raw Linux support...