[Frenzie]

First, I NEVER read PDFs on my Libra - nunca, jamais, mai, niemals, not ever. I have the impression that PDF reading is a major part of KOReader's raison d'être.

That's a bit of a catch 22 though. If you're not using KOReader, of course you're not reading DjVu/PDF, because it's slow and a pain. (And in the case of DjVu, unsupported.)

Originally Posted by Uncle Robin

Given those contextual details, what am I missing out on by not using KOReader?

If you don't feel like you're missing anything, quite possibly nothing. But trying coolreader, KOReader and Plato just requires a few minutes of your time — probably less than you've spent in this topic by now. If you're curious enough for that, maybe just do it. ^_^

The Wallabag plugin has become an unexpected killer feature for me over the past year. But of course you can also get Wallabag on plain Kobo with wallabako, or use Pocket instead.

Originally Posted by Uncle Robin

Thanks for your detailed and helpful response Jellby. It has strengthened my belief that there is little advantage for me in using KOReader. The new stock Kobo dictionary is so much better than the old one that it meets my needs, and the first point you list (quoted above) is an active turn-off for me - I like having footnotes hidden until tapped, saving screen real estate for the body of the text while still letting me read the footnotes if I choose to.

Fwiw, KOReader can do that too.