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Isn't the HTML->ePub workflow called zip?

EPUB got specific structure/components, which includes metadata files, and isn't just `zip book.epub book.html book.css *.jpg`. Of course can set-up from start to have expected structure, write xhtml files as expected, write metadata files manually, and create epub with just `zip book.epub -r *` but is more convenient via script/app.

I think you can make the metadata files with roughly a five-line Perl script.

>I suspect many people will prefer HTML for markup.

Most people hate writing HTML by hand. That's why we got lightweight markup languages like Markdown, Asciidoc, reST, etc.

I have the impression that an HTML -> epub workflow mostly consists of making a zipfile?

Many people will prefer Markdown or Commonmark for markup.