> That's definitely not the case in computer science and electrical engineering at least.

Same for astronomy/astrophysics. Most of the publications are typeset in LaTeX.

In the 1990s I used FrameMaker. It's still around, now owned by Adobe.

https://en.wikipedia.org/wiki/Adobe_FrameMaker

There's always InDesign, but given its time to proficiency, I think the bast case for similar purposes might still be something creating LaTeX/DocBooks source that ports well to InDesign.

Can't diff a indesign file, whereas latex is easy to diff.

Indeed, lots of people I know (mainly computer science, electrical engineering and physics) still heavily rely on it for long documents and papers.