I agree that using a JS runtime makes more sense that Emacs's weird e-lisp runtime, with all of its dynamic-scope weirdness. But dynamic scope, and e-lisp, isn't the only thing weird about Emacs. Emacs also calls "files" "buffers", and calls "windows" "frames" and "frames" "windows". It has weird keyboard shortcuts. Every third command also copies to the clipboard as a side-effect, which means you constantly oblitera…
Using "buffer" as a name for text being edited is hardly worthy of the title weird, vim does it too. Lots of other text editors as well. "Buffer" != "file", the first exists in the memory of the text editor process, the second exists on the file system. Their contents may differ, and one may exist without the other.
Likewise, calling the subdivisions of the screen "windows" is something which vim does too, and likely other editors also. For a text mode editor, it makes perfect sense. When you then port such an editor to a GUI, you end up with "windows" which are subdivisions of the GUI "window" – vim has that too, not just emacs. (Unlike Emacs, vim doesn't have the "frame" concept, because vim doesn't appear to support multiple GUI windows.)