My issue with EPUB readers is about features a PDF reader wouldn't even have. Small and annoying things like how much freedom I get when changing fonts and whatnot.
I haven't had a need to use annotations. I guess that could be solved by EPUB editors, but I haven't tested any, apart from any text editors after unzipping the EPUB.
Somewhat agree!. I think my main gripe is that there are no good-enough reader that: - without account integration - has good ux
Even some of the okay ones, most are, as tantacurl may say, janky.