I and i guess many other love to use the copy function in Webflow. Now with Ecom there are ofcourse things that can’t be copied betwen pages. I run in to this problem now when doing testing. Did a layout in my Products Page, want to use the same layout on other pages but can’t copy 
My suggestion is to allow copy but remove the the object that can’t be copied.
I know how to solve this but a new user will not