I think I remember seeing it on this community. It was a darkly colored video. It was mostly focused on UX design, and the guy was talking about pretty innovative features with auto completion suggestions and undoing and things like that. Does anyone remember it or have a link? My search was fruitless.
I ditched ZSH a long time ago because it wasn’t snappy. From what I remember, things like autocomplete, syntax highlighting, etc were written in ZSH and not build in. In something like Fish it is build in and it felt much faster to me.