The thing is Emacs, just like Lisp, can incorporate all those neat ideas without drastically transforming itself. I don’t know any strong features other editors have that users can’t replicate unless powered by closed source code. It won’t be as polished, but that mostly because users have different workflow.
Yup, Lisp is extremely malleable and egalitarian and unrestricted - that's why there's almost universally at least one dialect of Lisp exists for any non-lispy language and almost every known programming paradigm.
The only rule it insists on is the parentheses, and it's quite ridiculous how people dismiss the entirety of this foundation for incredibly powerful ideas and abstractions, solely for that reason.
