- It's not an editor
- It's not "compatible" with vi; it only implements a (very) small subset.
Also see: What is considered to be vi?.
We should focus the site on vi-editors, bringing in the entire kittenkaboodle that has keybinds vaguely reminiscent of vi and we'll basically be superuser or unix.se
zle are both stand alone special purpose text editors. Their special purpose is
This falls in scope of the guidelines proposed here: https://vi.stackexchange.com/help/on-topic
While my initial impression is to agree that this should be a "no", I also can't imagine that the subset of "all possible readline vi-mode" questions would be large enough to detract from this site in any way.
After thinking about it more (this was a complete reversal in an edit; if you read my answer before, yes, I'm indecisive) I think that these questions should be on topic — or at least should be considered on an individual basis. Having more questions about "vim-like" programs and plugins will only make this a richer community, and a more helpful niche of the internet.