Docs for elixir are pretty, too: here's a library that I wrote. The doc system is extensible enough that I could patch in docstrings from another language and also hyperlink (the </> buttons link to github) the GitHub code across languages (the `zig structs` section in the sidebar is autogenerated by parsing zig code) https://hexdocs.pm/zigler/Zigler.html

My joke is that you want to write documentation that's pretty and html-responsive enough that you can read it on the can between coding sprints.

I agree Go makes things more difficult to mock, but it's also the language I've used where it's easiest to avoid mocks and test the real thing. We have tests for REST and RPC services that... just make a service. There's relatively little boilerplate to make a gRPC or HTTP service with some basic expectations/fake data attached and just run your real client against that real fake server. ("Relatively" meaning, less than the equivalent mocks in Java, for a substantially more realistic test outcome.) And once you have this fake server, it's probably useful in multiple projects, while mock setup tends to be suite- or even case-specific.