It has been a while since I've used Word, but I remember it was really good at propagating tiny changes through a document that made it important that you keep an extra copy around because some seemed to have no easy way back to what you wanted.
This "feature" actually saved me quite a bit of work at a job I had a few years back. The documentation people were so afraid that anyone who was not a full-time Word expert would irrecoverably screw up the corporate branding (IOW, formatting) of their docs, they didn't want developers to directly edit them. So I was often able to get away with emailing a quick text summary to them, and they had to do all the fidgety proof reading, formatting, etc.
I don't know how they managed to get their jobs done, given that they had no real source control and mainly juggled each update amongst themselves over email and random impoossible-to-find folders on Sharepoint.
Since all the docs had the same basic layout and they were mainly trying to make them look consistent with whatever corporate branding was being promulgated that week, it could easily have been done by writing them in "markdown" and having a script that converted them directly to PDF. Or maybe even learn LaTeX. Then the docs could all be maintained and diffed in github like all the other project artifacts. I didn't even bring that up because I knew that their heads would explode.
