Not at all. He used Word for his part because it was relatively low on equations, and it is what he normally uses in his field. My part of the paper was full of equations, some rather complicated, so we mutually thought it made more sense to convert it all to LaTeX, as that conversion was straightforward. The ultimate conversion in the other direction was a nightmare, despite the fact that I’m comfortable with Word.
I wrote my PhD thesis in WordStar, with printer escape sequences for the special characters. It felt a little like that.