Many journals require LaTeX due to their post-acceptance pipeline. I use Typst for letters and those docs for which my PDF is the final version (modulo incomplete PDF/A in Typst), but for many journals in my field, I'd need a way to "compile to LaTeX" or the journal would need to implement a post-acceptance workflow for Typst (I'm not aware of any that have).
Right, I guess that’s my point: If Typst wants to compete with LaTeX, IMO it needs some sort of mechanism by which journals will deem a Typst submission acceptable, along with readily available templates for said submissions. That’s a big hill to climb probably, but probably the single most valuable development they could achieve from a product diffusion perspective.
Interestingly enough, e.g. Elsevier accepts latex but has their own typesetting backend. Which typically means that the last editing steps are quite annoying, because even if one is using the provided latex templates, what actually happens for the final typesetting is done by some mechanical turk editor on a slightly different publishing system.
Exactly - they require LaTeX not only to make it match the style, but because the final document is a prepared LaTeX work. Sometimes you can even see all the hooks and such that are waiting for \include and similar.
