Why PDF missed the internet revolutions
Let us look back at the history of LaTeX "typesetting", i.e. the process of producing tangible output from a LaTeX source.
LaTeX is built on top of TeX, which is designed to be a page layout program designed for the press. Quite logically, the process that creates PDF output from a LaTeX source is unseparable from page layout.
Now, we are in the 2020s. How do people (notably the younger) consume information?