When creating a lesson, it is very frustrating to have to recreate the entire slide again, when all you want to change is a couple minor details. It is incredibly time consuming! For example, I am creating a lesson for kindergarteners using the number line. I have to click the plus symbol, then go back to find the page under the correct category, delete all the stuff I DON'T need (almost everything that comes on it), and input all my own stuff again.
It is easier to just make a copy of the lesson and edit that, however I don't want 10 different lessons already on the same topic.