I make what I call 'web-books' in addition to EPUB and PDF and print, which provides a good workflow for EPUB preparation. By making a web-book available as well there's more choice for people who read books on smartphones and tablets (and PC screens maybe too), since they don't have to use an EPUB reader they can use a browser and take advantage of its superior rendering capabilities. And blind people probably have a better experience using the web-book rather than the EPUB.
Matthew Butterick sort of pioneered a conception of web-books, such that he doesn't even provide PDFs or EPUBs:
https://practicaltypography.com/why-...ok-or-pdf.html
I think he makes some good points there, though I myself prefer a range of options.