This request isn't new, and it received over 400 votes. But STILL there is no simple Copy feature. I have tried to make this as simple as possible for the Developers to understand what is needed and hopefully we will get the feature added to development.
It would be a button added to the Outcomes page (see below) "Duplicate Outcome)
For the pages, it is simply an option in the dropdown menu for each page:
and for the Assignments tool, again, simply an addition to the existing menu: