> While I knew that some pages were less frequently visited than others, I was surprised to see that there were modules that accounted for less than 0.1% of page visits. This meant I could remove them entirely without affecting 99.9% of users. I could delete entire directories containing dozens of files and thousands of lines of code.

I don't know about the author's application, but a data driven approach is not going to give good results. In my podcast hosting software, the "delete podcast" button is used maybe once every other week (by the numbers). But if I got rid of it, I'd be fielding support requests for every user who wants to delete a show. And that's a highly manual cleanup process to do by hand.

Which is to say, features don't need to be a high percentage of traffic to be important.