> probably also switch to fish anyway.

I feel attacked. In all seriousness: so long as you have a POSIX shell available (and set as default), you don't have to use a POSIX shell. I rarely do anything with fish syntax because I mostly use it for the REPL experience.

> Hmm, in this false analogy game, what editor is aligned with korn shell?

vi (not vim), preferably running on OpenBSD :)

nvi

OpenBSD (as well as the others?) come with pdksh and nvi out of the box.