I was like you, until my library grew to a certain size and I needed/wanted to organize it and display it better. Calibre lets me tag books, so I can pull them up by arbitrary categories which I can't EASILY pull off only using filesystem features. With Calibre I split my ebooks into two libraries (one for computer books, one for not computer books) and tag to my hearts content and requirements. I keep it simple to 2-3 tags for each book so I can later find my computer books that are "python, security" or my "reading challenge, crime/mystery, unread" books without dealing with extended attributes and the find command. Calibre also travels between linux, macos, and windows and so do the tags; unlike the filesystem where I'd get the joy of retagging all this stuff if I am on a different system (say, copy of my stuff on Windows means I have to retag with NTFS alternate data streams).
Same thing with pdf's - I used to keep a bunch of docs in my own subdir, until it got to be 1000+ pdf's and I discovered Mendeley Desktop and its tagging feature. Now I can find stuff much faster.
Same thing with my music collection, same thing my with photos.
Your needs may be minimal enough and your computer skills sufficient enough so that you get by with the filesystem, but I would venture to say the average user is much better off with an app/library method of organization. e.g., I can't fathom organizing a non-trivial photo collection via the filesystem only. I know I'm better off with the app/library method of organizing data, something I came to realize after my initial resistance.
I would even venture to say the average user also finds Calibre complex. Would you mind taking BookFusion for a spin?
We have uses with over 30,000 eBooks in their libraries and will be able to support your collection without issues. BookFusion allows you to easily upload, read and organize(tags and categories) your eBooks.
Your entire Calibre eBook collection will be available across all your devices while keeping your bookmarks, comments, highlights and reading progress synced.
I'd rather not. The beauty of Calibre is that you run it locally, or on your NAS (with Calibre-Web). If I want my dat in "the cloud" I'll just buy some Kindle device and be done with it.
Same thing with pdf's - I used to keep a bunch of docs in my own subdir, until it got to be 1000+ pdf's and I discovered Mendeley Desktop and its tagging feature. Now I can find stuff much faster.
Same thing with my music collection, same thing my with photos.
Your needs may be minimal enough and your computer skills sufficient enough so that you get by with the filesystem, but I would venture to say the average user is much better off with an app/library method of organization. e.g., I can't fathom organizing a non-trivial photo collection via the filesystem only. I know I'm better off with the app/library method of organizing data, something I came to realize after my initial resistance.