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Some languages just don't work well or at all with ePub 2 due to lack of vertical writing and right to left support. Plus the addition of MathML for science/math textbooks.
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Yes, ebooks especially KF7 were too US Centric. A solved problem 10 years before anyone made an eink reader.
The language support, decent LTR, RTL and vertical in one page.
I agree in theory many science textbooks should be possible, but some would be challenging on 6", even 300 dpi, never mind the old 800 x 600 or 167dpi screens.
All of that (bidi, asian, mathml) should have been in epub2. Absolutely short sighted it wasn't. I'd seen DOS text mode do bidi in 1980s.
Problem is as a publisher how do I know how many physical ereaders support mathml, Bidi and vertical? So we stick to epub2 for fiction and PDFs, ideally paper, for stuff that doesn't work on epub2. We test on real physical ereaders.