Lots of doctors still depend on "faxes" even though that tech has been dead for a long while and is now just sending PDFs using a very old protocol. Word will die the day highschools and unis stop requiring docx files. Which given education institutions tech will be a very long time.

I'm old enough to remember a time when .docx was new, in my childhood Word saved as .doc. A standard that's been replaced once can be replaced again.

I've used Markdown and AsciiDoc, I know there's also something similar called reStructuredText. You can export from them to HTML and then apply any CSS you want to that, including 14-point typeface or any precise margins you want. I see no reason why a user-friendly interface to Markdown or AsciiDoc or reStructuredText couldn't be made to work for lawyers.

But of course if the only problem you're trying to solve is that docx is a binary format and doesn't work well with git, then there is always this: https://superuser.com/questions/1917024/can-we-convert-simple-docx-files-into-some-single-flat-ooxml-file

I havent used word in over a decade. Its literally the worst word processor out there.