Based on a few old mailing list it's apparently only very slightly so, and i'm not dissing emacs, it's just that the people who made lisp os and it's graphical layer really did allow users to augment and interact with most of the system in a very fluid and capable manner. Some examples from that mailing list (thread from the 90s or maybe even 80s) were still not present on a daily basis for code edition / versionning in the 2000s. Makes you wonder