[mazork]

I've read for hundreds if not a thousand hours on my Kobo Clara HD. I've never heard of Koreader, but from what I see it seems only really useful for PDFs ? I never read PDFs, only epubs, and it looks like on Koreader I would be missing stuff like chapter progress, length to read next chapter/rest of the book, marking finished books, etc.

Am I wrong in thinking all these quality of life things for simple book reading are not present on Koreader ?

[deng]

KOReader has all these features and much more. I particularly depend on the possibility to quickly override styles in badly formatted ebooks, great support for StarDict dictionaries, OPDS support for quickly downloading books from Calibre server, and much more flexible configuration of the backlight.

[iFreilicht]

Where are you getting that from? The github repo (https://github.com/koreader/koreader) lists many supported formats and features, including epubs.