> On the rare occasions when I'm forced to use Word, I find it an incomprehensible mess. I don't understand why users continue to tolerate it.

Some comments above focus on legal docs. I've provided support to practicing lawyers. They don't have time to learn new tools that maybe support the majority of what they need because people on this site know there are alternatives. They're locked into Word so that they can focus on the part of their work for which they are trained and it's not software like you or me.