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There are two mentions of Gerrit in the article. Granted neither goes into detail, but both reference it as prior art on the topic.

Oops. I must have missed the mentions.

Doesn't he do just that?

> They're already a well-explored user experience problem in existing products like Gerrit and Phabricator.

I used to work at FB, and unfortunately the Sapling review client that shows GH PRs has nothing on the the actual internal code review tooling at Facebook (now called Diffs, formerly Phabricator). I miss that tool so much

I believe sapling uses https://github.com/ezyang/ghstack under the hood for stacked PR.