LaTeX is still very much in favour in my field of geophysical research. I believe that the same is true across most fields that rely on mathematical notation to explain things in written form. I've never found it difficult to write in a non-WSIWYG system ... indeed, it is really quite convenient.

Years ago I had a student in my class who was unable to make out written material, but had a machine that read text aloud. My class notes (some 300+ pages) are chock full of mathematics. I went to the student's house to see how that reading machine worked. Provided with LaTeX input, it said a lot of things like "backslash alpha" and "begin open brace equation close brace" stuff. I wrote a quick perl script to change it, so it said "alpha" and "begin equation". Presto -- it was exactly what the student needed. This was, as I say, many years ago. Maybe now there is software that can handle MSword files, etc., but that definitely did not exist at the time. The result? The student was able to take the class, and did very well in it.

LaTeX is alive and well. I absolutely don't have the feeling that's going to change anytime soon.

All the conferences I'm looking at have word and latex templates. Word clearly isn't going to replace LaTeX for many reasons.

Truth to be told: As long as you're given a template and have to stick to that template, LaTeX is all you could ever want. With overleaf there's barely a tooling learning curve either.

It’s still 100% LaTeX in my fields (AI, ML, robotics, telecom).

> is LaTeX also falling out of use for technical papers?

In mechanical and aerospace engineering broadly, I see less use of LaTeX over time. It's hard to estimate precisely which percent of the market is LaTeX vs. Word vs. something else, but I think I can see trends. Almost no one where I work uses LaTeX, though LaTeX used to be more popular there.

I think it probably varies a lot by narrow specialty and publication venue too. Papers submitted to Journal of Fluid Mechanics seem to overwhelmingly use LaTeX. The main conference I would submit papers to during my PhD is primarily Word (though I used LaTeX). I have seen at least one Word-only engineering journal, though it wasn't something I would publish in.