Typst is a replacement for TeX.

Not LaTeX.

You'd of course need to read the documentation on what TeX and LaTeX are to understand this. Most people would rather write a new system.

I don't know why you think the condescending tone is appropriate. I've been using LaTeX for twenty years and I believe I understand the difference. I also respectfully disagree on your assessment of Typst.

Have you written documents in raw TeX?

I’ve written book-length documents in Plain TeX (probably what you mean — nobody writes in “raw” tex) and in LaTeX. I would say that Typst, if it’s a replacement for anything, is a replacement for LuaLaTeX, because of its programmability. But in this article I framed it as a possible LaTeX replacement:

https://lwn.net/Articles/1037577/