My "pro" use case is to allow people to read a bookshelf worth of paper without having to lug around the bookshelf or download it over a slow internet connectio

My "pro" use case is to allow people to read a bookshelf worth of paper without having to lug around the bookshelf or download it over a slow internet connection. It is a consumption use case! But since what is being consumed is a bunch of PDFs in a folder, rather than the output of a proprietary app for accessing a subscription service, this has always required ... a proprietary app for accessing a subscription service like Dropbox, or at least a self-hosted version of it using SMB/SFTP.