The Gutenberg HTML versions are for web browsers. I used to download mobi before they called it old Kindle.
I download their epub and convert it to epub to automatically fix the dialogue/quote punctuation and change spaced paragraphs to indented.
Sometimes I need to fix them in the Calibre Editor.
The only thing less useful than HTML, and very much less useful, for ebooks is PDF.
If I need to seriously edit the format/style/layout then exporting mobo/azw3/epub/epub3 to docx or even RTF and then Save As odt in LO Writer. A final extra Save As in docx when done to import to Calibre and make an epub.
HTML & CSS only involved internally in the ebooks, which may need a slight edit in Calibre or Sigil at times.
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