So anyone looking at your code and doesn't understand why you implemented Foo the way you did has to dig through 500 commit messages to find when it was added.

So anyone looking at your code and doesn't understand why you implemented Foo the way you did has to dig through 500 commit messages to find when it was added. Or worse, you are working with 2 dozen other programmers, all working under their own forks, and they have to look through all of that since they don't know who was responsible for adding the code. Thanks.