[Havvy]

Each lisp varies dramatically in its semantics. Just because emacs is written in e-lisp does not mean it has first class language support for every other lisp. Would you say that vim has first class support for every language with block & statement based languages?

[viksit]

Agree with your high level point. Mine isn't that because it's written in e-lisp, emacs supports every other lisp. The fact that it's written in e-lisp makes it very extensible, and some standard things like C-x C-e to evaluate forms et al, which were originally developed for and are the standard for e-lisp, have been adopted for all other lisp modes as well. The very fact that the editor is written in a lisp makes it expose useful functionality this is useful in other lisp contexts.