Are those advanced packages needed for ebooks? Consider Knuth's TeXbook, written in plain TeX (the source is available on CTAN) and which looks good enough for

Are those advanced packages needed for ebooks? Consider Knuth's TeXbook, written in plain TeX (the source is available on CTAN) and which looks good enough for me: $ time tex texbook.tex Output written on texbook.dvi (494 pages, 2029384 bytes). Transcript written on texbook.log. real 0m0.615s user 0m0.584s sys 0m0.024s (And an e-book reader would only need the information in a DVI file, assuming the fonts are built-in.)