I mean, as with code, the actual typing is not really the bottleneck.
I also basically read the right pane rendered output, but mostly as a "reading out what I've written and evaluating whether it sounds good" most of the time, not really messing with layouting (especially that LaTeX and Typst does that very well, I can be reasonably sure that my paragraphs will have decent hypens and such).
I theory, yes. And that's also what I'm usually trying to do.
What I have observed though with Latex folks is that they type 3 words and then look at the preview or re-compile to see if it looks good.