Because stdlib was written before modules were a thing. Regarding the "lets keep GOPATH going" argument, there was an issue about this on github where the arguments around the issue were fully explored.
https://github.com/golang/go/issues/37755#issuecomment-771879911 > thanks. expressed virtually all i was about too. > > BTW something i just noticed..... > > i lean on the std.lib. for patterns/references/best practice, how come its > not modularised? > > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/0808eab8-0f75-4c93-9bae-e2ef76cc6f0an%40googlegroups.com.