The export to .docx so that you can use other tools to create an EPUB cause issues too - unformatted lists (bullet lists) get left out of the export, "Chapter ##" is prepended to the chapter title with no way to turn it off, apparently a hard return is not supported very well (at least I have not found a browser yet where I can do what the help suggests should work) so a list of information appears as a series of new paragraphs, and all of these make it so that you have to do a LOT of additional work to get to EPUB format.