UUID is just array of 16 bytes or two 64-bit ints. Generating UUIDv4 is like few lines of code. Is that a big deal? I don't think so.

It makes you look on GitHub for implementations, which later can be hijacked and used for malicious reasons

What's the language you're thinking of that has more of these decisions fixed in the standard library? I know it's not Ruby, Python, Rust, or Javascript. Is it Java? I don't think this is something Elixir does better.

the idea of what 'batteries included' means has changed a lot in the past twenty years, and like most Go quirks , probably Google just didn't need <missing-things>.

What other basic stuff are you thinking of?

Now do Javascript.

https://github.com/rs/xid

Go has one of the best stdlibs of any language. I'd go as far and say it's the #1 language where the stdlib is the most used for day to day programming. cut the bullshit