Why do you think it's best to give no indication of what was changed by a particular commit? While I feel strongly against this, I'm really asking out of genuine curiousity, not to bash whatever seems to be working for you :)
Also, commit messages are a form of documentation; but they are one of the least useful ones. Much less useful in my opinion than docstrings, topical guides, references and blog posts. So I think that spending time on them is a much lower priority than spending time on the other kinds of documentation.