I never had performance issues, but I don’t read huge books or anything. There seem to be some online converters, but I agree that is not the most ergonomic. Maybe calibre-web could also do the job, with you connecting to it through your phone’s browser.

Never heard about the kepub format but I’ll look into it, sounds cool.

Kobo ereaders are great, when I’m on trips I download epub files on my phone, plug the ereader to my phone via USB, copy-paste the books and it just works. No need to install anything on the Kobo.

Hey you made the claim in the first place, you have the burden proof. Don’t attempt to shift it.

As if American cars had any reputation for reliability XD