Earlier quoted context omitted.
Most (all commercially available?$ebook readers are not as simple as that. And a file manager doesn’t track which books of mine are synced and which are not. Calibre does. A file manager does not make it easy for me to correct the ebook’s metadata so it appears properly on the ebook reader. Calibre does. Calibre will also automatically download metadata for you from a variety of sources (with many options for the lev…
So "it's job is not well defined". It's a webserver, file manager, sync client, transcoder/converter, RSS reader, metadata manager all in one. With all possible regards and respect to the author, I find calibre a terrible mess. It does a lot of things, none of which very well. And the one thing that I want it to do, it doesn't. Not reliable or not at all. I want it to give me access to the ebooks I buy online. This i…