One of the truly great programmers I met at VMware was almost obsessive in the way that he thought about not just commit messages but the entire structure of the commit log. The goal was to make changes appear as a flow of understandable commits that build to some greater goal.
I would add that's in some sense "externalizing" an ideal flow state in the sense of the article. Real flows are hesitating and often emerge incoherently. So you end up reworking the commits to represent the path you would have followed had you understood things fully at the start.
