I've only heard Knuth and Lamport speak respectfully about the technologies that came before tex and latex.
Do you think it is sufficiently respectful of TeX/LaTeX?
As far as proponents go, I will echo the sentiments of many people who have actually used both TeX and Typst: I have been able to accomplish many things in Typst within an hour or two by writing my own Typst code, that in LaTeX I could only accomplish after several days by cargo-culting indecipherable gibberish from years-old forum posts. I freely admit Typst can't (yet) match LaTeX's long-tail package ecosystem, but it is much more pleasant to use and easier to reason about.
In comparison Latex has a very particular way of doing computations that you will have to learn from scratch, and even then it won't be as easy or intuitive. The fact that Latex relies so much on packages for many things also means that you will have to learn their details and intricacies when trying to do interoperate with them, which makes this even more complex.
I still use Latex because of the output quality and the sunk cost..but we can clearly do better