As stated by the W3C:There are no reasons at all in theory for people to change URIs, but millions of reasons in practice. Considering there are perhaps billions of URIs on the Web, we’re talking about a LOT of 404 errors happening constantly, wasting much time, energy, and resources. And without proper redirection, broken resources result in 404 “Not Found” and other errors. Broken pages, broken links in apps, bookmarks, documentation, basically a lot of “broken” everywhere on the Web. It’s a quietly destructive process that leads to a broken, 404 Web.