> I haven't met anyone who knows Typst even exists.

It was released in 2023 and became polished enough to use like last year. Yeah, adoption takes time but the technology is significantly better.

> The problem is also momentum. Do you rewrite 30 years' of CTAN contributions, internal templates/styles and the toolchain off and start again or not?

With latex you have to rely on third party. With typst you can write it yourself (or with an agent), like writing functions is not painful in typst.