Directory / Folder based browsing with KOReader, or using Android Pocketbook or Lithium is ghastly compared to native Kobo with Calibre.
I can drag and drop to Kindle, Nook, Sony, Kobo, Binatone ereaders or aps on Android. It's inferior to managing ebooks without Calibre and I abandoned Kindle because the Collections became essentially Amazon controlled and Series only added later and usually wrong. Only a Jailbroken Kindle is now any good Collection and Series.
I use Calibre to edit title Metadata as now Amazon ebooks have part of the blurb in the title. I make the author names consistent. Manage published & acquired dates. Tags, Series and Collection. Add descriptions in metadata (shows up in Kobo).
KOReader can search Calibre Metadata file, but it's clunky. Browsing author then title needs Calibre to Export the files & directories. Simply downloading and drag/drop doesn't do it!
If you have more than 50-100 titles and certainly more than 1000 then Calibre is needed for "any ereader that supports system folders".
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