Totally agree with the "might me good for maintenance mode" sentiment. I'm working on a pre-1.0 project. I'm thinking about the few commits where I was first implementing localStorage caching. Tons of files were effected on each commit. If there was a particularly tricky line in there (there were several), how would I have specified it in a commit? That'd be extremely hard to read when compared to the alternative of putting the comment above the code.