In previous versions of Phabricator, marking a diff as Requires Changes would remove it from my Blocking Others section. This meant that I knew that the code author was now responsible for making changes and I didn't have to do anything at the moment. Now, the marking a diff Requires Changes leaves it in my Blocking Others section. This means it takes a bit more work to know if anyone is actually waiting on me.
Side note: accepting the change will remove it from Blocking Others.