You could take the beginning of habit 5 as complementary to Emacs. Has another program ever been extended to do more?

Towards the end of point 5, Bram really points out the strength of Vim over Emacs - it is small enough that it could be refactored to be embeddable. This is the real slight towards Emacs - Emacs will never be embeddable, not in a hundred years. It is the all-purpose consumer that provides little benefit to outside programs. I think Bram saw a niche in creating a 'libvim' that other programs could use