Comment by red_admiral

Markdown and Typst serve different markets - I don't need page layouts and font choices in a pull request, for example. Typst is however a good Markdown++ in that once a collection of markdown files grows to book size, it's easy enough to port.

Typst challenging TeX would be my dream too - there's a lot of math you can port just be leaving off the backslashes. Mind you the kids these days know TeX primarily as "that language in overleaf".