I think that an absolute eraser would be beneficial for Goodnotes. It would work with a higher level of erasing than what is currently available, not only erasing annotations but erasing whatever was imported. For example, importing a handout from university, an absolute eraser would allow us to erase a specific paragraph so that we can write and reword it better which fits our understanding better. This is not limited to rephrasing but also making it such that some words may be erased for fill in the blanks to promote active recall without the need to do flash cards. I have tried using a white large pen however it is very inconvenient since it is still too thin and the can be accidentally erased. It would work similar to a background eraser in photoshop.