Emacs Internal #01: is a Lisp Runtime in C, Not an Editor

I tried to move to an LLM-friendly platform like VSCode or Cursor, but I kept returning to GNU Emacs. After reading other users' stories, I realized this is a common pattern. Very few tools survive 40 years and still feel hard to leave. I read parts of the source code and discovered that Emacs is not just a code editor. There is design philosophy , system software trade-offs , and code that still…