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I guess I assumed that, for example, multi device support on websites for various device widths entails a bunch of CSS, which means the epub renderer would have to also do that, which basically means a whole web browser.

also that things like footnotes or anything that has a floating reference (table of contents links for example) might get very complex or require javascript

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since ebooks are primarily (only?) text you don't have to worry about UI elements and such which simplifies a lot of the css

footnotes aren't really a thing with ebooks (at least as far as displaying the note on the page with the text). Because it is just a html renderer, footnotes are presented as mutual <a> elements located in the endnotes at the end of the book

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