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? They use the Internet, and, in most cases, though a smartphone. Or a tablet. Or a laptop. Or on a desktop computer. Or several of these.
In that context, page layout design is not only inefficient, it is counter productive. How can you fit a page layout into such a variety of device formats?
Let us push the discussion further. What is the favorite use of PDF? Legal or contractual documents, invoices and the like. Documents that cannot be modified. Documents that are opaque.
Can you search the content of a PDF file on the Internet? No. It is not designed for that.
Google, the undisputed leader of the internet search engines, publicly advocates rich content, speed of delivery and mobile compatibility, over design.
To be visible, to be viewed, to be read and understood, it is essential to abandon the page layout foundations of TeX in order to embrace modern web technologies, without abandoning the LaTeX language itself.