Thanks for explaining that. Having a bit of a (dim) lightbulb moment now. I’ve never used Gerrit - just GitHub and GitLab and Forgejo. So I assumed the PR/MR model was more or less universal. But if smaller development commits are being squashed into the shippable/reviewable unit - then the focus on commits makes a lot more sense.

You're welcome! It is one of those "do fish realize they're wet" kind of things, tools can shape our perception so strongly that you don't even realize that they're doing it!