The context for the discussion is browser rendering for variable sized screens and user interaction in mind. Centuries-old typography rules can't be applied directly for screens.
For paper documents you can already do Markup -> LatTeX -> pdf for good quality documents.
> Centuries-old typography rules can't be applied directly for screens.
Some of it, certainly not.
A (larger IMHO) part of typography wisdom has really been distilled from experience making text easier and prettier to read over generations, and should not be thrown away lightheartedly because "screen is different from paper". Yes it is, but human eyes and brain are the same ;-)
For paper documents you can already do Markup -> LatTeX -> pdf for good quality documents.