True. But you could either repurpose the left/right icons to move via bookmarks, or simply have the up/down arrows move to pages containing
either bookmarks or scribbles... so many different possibilities!
My thinking is to use the folder buttons to open and switch between multiple documents simultaneously. So for example, let's say you have a document open. Then pushing the document button brings up the document menu without closing your current document, allowing you to open a new document. With two or more documents open, pushing the button lets you switch between documents. Or you could switch from notes to a document and back by pushing the respective folder buttons...
Anyway, that's why I think we should leave those buttons alone.