[MarjaE]

I sometimes want to use Calibre with my e-reader plugged in, or forget to quit Calibre.

Because Calibre uses one style of folder organization, and my e-readers use other styles, there's no point exporting from Calibre to either e-reader. I have to export from Calibre to a transfer folder on my computer and then copy the appropriate parts of the transfer folder to each e-reader. I don't think there's any point indexing either.