Not only mathematics, pretty much everyone in the world of science/academia uses LaTeX. For git, I've seen some stuff, but most researchers that program a decent amount are reasonably familiar with git as well.

That's still a far higher degree of technical competence than is possessed by the target audience for PowerPoint, Google Slides, or LibreOffice present. Also, claiming someone isn't technical just because they're not a computer programmer is a little odd. Most programmers I know don't go anywhere near LaTeX because it's so confusing and the spec is so complicated. They use powerpoint, Miro, or markdown slides when they want to present something.