The typesetting is better because PDF documents don't have to flow and resize across screens. This means a post-processing step can tweak hypenation, letter sp

The typesetting is better because PDF documents don't have to flow and resize across screens. This means a post-processing step can tweak hypenation, letter spacing, etc. to give the whole document a pleasing look. On the web it's a lot more difficult, but not impossible, to do the same and work on every possible size screen. There's also growing work to make typesetting style hyphenation and such work in browsers in the near future: https://developer.mozilla.org/en-US/docs/Web/CSS/hyphens https://developer.mozilla.org/en-US/docs/Web/CSS/hyphens