A unit of change is a commit. I have no idea why you'd think a PR is a unit of change.
Does your org approve specific commits or PRs overall?
PRs. This is largely why we don't do stacked PRs: they can just be a chain of commits in one PR
Does your org approve specific commits or PRs overall?
PRs. This is largely why we don't do stacked PRs: they can just be a chain of commits in one PR