To add Slackware to the list: nvi 1 (1.81.6) was added to -current(15) on Mon Jan 13 00:11:55 UTC 2020, replacing Elvis as the default /usr/bin/vi provider. It shipped in stable with Slackware 15.0 (Feb 2022). It recently merged the Debian patchset, so Slackware and Debian now share most of the nvi 1 fixes.
One nice detail: when nvi was introduced, Elvis was rebuilt to drop its /usr/bin/vi and /usr/bin/ex symlinks, and nvi only provides those symlinks if no other editor already does.
I just added an "NVI ACROSS UNIX SYSTEMS" section to some notes I keep, if anyone's curious:
repo.or.cz/code-notes.git/blob…
