[wirrbel]

Yes and no.

I think what you say is definitely the goal for day-to-day contributions.

However, there are changes to a code base that are more "Manhattan project" in nature where not all changes can be neatly packaged into their own commits, OR the PR author kind of needs to re-do their coding on a clean room branch. Which is significant overhead.

Being able to undo a commit is a means to an end, not the ultimative goal.