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> Unfortunately, the community that has sprung up around Go is more or less opposed to new language features on principle.

I think this comes straight from the original go team. Rob Pike had a talk[1] that is partly about why go doesn't keep adding features and why it doesn't have certain features that other languages have. I think people who like go have bought into the idea that the go team has made good trade-offs to make go code easier to read and maintain at the expense of expressibility.

[1]: https://www.youtube.com/watch?v=rFejpH_tAHM