I know it was more of a joke, but there are actual reasons not to use ZZ. (1) The difference is small, but one could argue that shift-z shift-z are more like 3

I know it was more of a joke, but there are actual reasons not to use ZZ. (1) The difference is small, but one could argue that shift-z shift-z are more like 3.5 clicks, while shift-dot x are certainly 3 clicks. (2) People are used to do a colon before an actual interaction with the editor instead of the text. (3) taste. Even if one argues that both has the same effort then taste is the final decision and there people can be different.