Comment by noirscape

It also avoids a lot of the bloat that e-reader OSes tend to have for vendor lock-in reasons in favour of giving you software that's actually usable. Especially if you have a slightly older device where they've quietly started to pull the plug on most of the services or have pushed OS updates to the device past the point where the specs of that device can handle it.

That alone is a big feature that makes KOreaders existence worthwhile.

The only weakness is that there's no real "true" library view as far as I could find - you're stuck using an SD card browser, which is fine for me but is a notable presentation downgrade.