> Notably [go] ended up giving up on [gerrit]

That's not accurate. They more or less only use Gerrit still. They started accepting Github PRs, but not really, see https://go.dev/doc/contribute#sending_a_change_github

> You will need a Gerrit account to respond to your reviewers, including to mark feedback as 'Done' if implemented as suggested

The comments are still gerrit, you really shouldn't use Github.

The Go reviewers are also more likely than usual to assume you're incompetent if your PR comes from Github, and the review will accordingly be slower and more likely to be rejected, and none of the go core contributors use the weird github PR flow.