It would be great to have folders. I have copied books that others have written about their families, and I have journals. It would be great to have those pages in folders, so they are not so cumbersome in Memories. Thank you.
There is already the ability to use Albums to organize your Memories. How is that not meeting your need?
And I would suggest that if you have each page of a book as a separate image, you could make a great improvement by combining those pages into a single PDF memory. Then the pages of the book can be read in order by people. Having separate pages generally creates a lot of clutter, both for the contributor and for any readers, as opposed to one nice simple PDF document.
This already exists. It's called ALBUMS instead of FOLDERS