MD is pretty simple, but why would a lawyer want to learn a limited,presentation-oriented syntax? And a wiki? Both of these decisions would make red lining a new, unpleasant adventure, something every lawyer I know does A LOT.

Highly relevant: On the Immortality of Microsoft Word [0] (and the HN discussion [1]).

[0]: https://theredline.versionstory.com/p/on-the-immortality-of-...

[1]: https://news.ycombinator.com/item?id=46313518