If Emacs is not a text editor, then what is it really?
I’m one of those who like to say: “Emacs is not a text editor!” And when someone asks me what it is, I usually reply: “Emacs is a poor man’s Lisp Machine.”
The old idea of an Integrated Development Environment (IDE) was quite different from modern IDEs. It used to mean a runtime environment (almost an operating system) where everything was written in the same language, where you could tweak anything and hot-reload code at will. In such an environment, every program you wrote was “integrated” with the others.
In that sense, GNU Emacs is an extensible Lisp environment, whose philosophy is inspired by old Lisp machines and systems like Symbolics Genera.
It is the forerunner of VSCode in Elisp.
Still better than VSCode, if you master they keybindings.
I agree that it is a poor man's Lisp machine...and for all practical intent every other type of person's Lisp machine.
I mean Lisp machines were still built on the Von Neumann architecture and were general purpose computers. The hardware bits of a Lisp machine are exactly as colorless as the hardware bits of a 486SX.