I really appreciate this research. Serifed Fonts make sense for legal briefs. The fact that so many judges are drafting documents in monospaced Courier is rather surprising, though I guess the skeuomorphism may have some appeal to typewriter nostalgia.
The thing that I immediately think of when I see this are the old threads on programming fonts here on Hacker News:
<a href="https://news.ycombinator.com/item?id=1058946" rel="nofollow">https://news.ycombinator.com/item?id=1058946</a>
There was a ton of variety, but everyone was using a monospaced gothic font.