It was purposely not built as it could cause issues. e.g. if you are copying a drip that was set to run instantly, it will run again as soon as the copy is made. Could be problematic.
I just want to duplicate the HTML Content of the email itself so I don't have to create it from scratch or go into the editor of one and copy the source code so I can paste it on the next. I don't need to duplicate all the settings.