I've never thought about it this way. I've always used it as a summary, so I can understand what has been done when browsing the history. It allows me to find

I've never thought about it this way. I've always used it as a summary, so I can understand what has been done when browsing the history. It allows me to find changes that I want to cherry-pick or revert. OTOH I can see benefit of describing why a change was done as the summary, as then git blame on the line is a lot more effective.