It's great to see Typst getting more visibility. We migrated a real-world workload to it a couple of years back: generating and e-mailing 1.5M+ PDFs daily at my org, Zerodha. Our previous pipeline was LaTeX-based (first pdflatex, then lualatex), but we were constantly fighting cryptic memory errors on large documents and huge Docker image sizes that slowed down boot times of our ephemeral workers. Switching to Typst…
For your use case, why were you using LaTeX in the first place? That is more surprising than finding a replacement for LaTeX.
Some people might say that writing in XML is annoying, but it isn't if you have a decent XML editor. In my case, it is Emacs nXML mode. Customisation is possible with DITA-OT [1] and plugins, and yes, it is also based on XSLT. Overall, I think DITA is an industry-proven XML powerhouse. It may be boring, but it has huge potential for anyone with advanced documentation requirements.
[0] https://dita-lang.org/dita/archspec/base/introduction-to-dit...