Thanks. Can you explain why that might be a good thing?
If I update the diff, does it become a new reviewable item, independent from the first version?
I've never worked at a large tech company but my understanding is that at e.g. google there is some sort of monorepo, so it would presumably zoom forwards while a commit is under review. Even so, why is it not a good thing to review the commit in an explicit location in the historical commit graph?
Email is one (very clunky) way of implementing such a workflow, there's other tools like Gerrit, Reviewable or Phabricator that are more friendly.