nvi2, which is what you get in DragonFly when you type “vi”, has been updated to version 2.2.2.  The nvi2 README gives a little history of how many years this has been around.  Close to 50?  A family tree would be interesting.

Related: turning on vim mode in Obsidian gets you this entertaining dialog:

Shouldn’t it be “vi mode”?  Oh hey, look, an esoteric definition argument, just what you came to the Internet for.