With paper you can't erase obviously I can, and do, quite easily. I have a twist-out eraser on the end of my pencil plus an artists' eraser in each pen/pencil

With paper you can't erase obviously I can, and do, quite easily. I have a twist-out eraser on the end of my pencil plus an artists' eraser in each pen/pencil bag, so I can make pretty quick work of some portion of a page, but if I really want to erase the page, I can do it faster with paper than with a whiteboard: I turn the page.