You can keep AppCleaner for other uses. Who made bad experience using it probably did not check all elements in the uninstall popup window - then these components will stay. This is the option if you just want to remove a program, leaving the data on the Mac. In case of EN, I would always do a full uninstall, because the data will sync again from the server. Only caution: If you use legacy clients, local notebooks will be deleted as well. Make sure to have a backup of these.