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> I never understood why it was impossible to have any kind of multithreading in emacs.

There are various ways to do multithreading in emacs now, but the answer to your question is usually “there’s a lot of existing elisp that isn’t thread-safe”, and that’s still kind of a problem.

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I’m still a novice functional programmer so this may be a dumb comment but I thought a lisp would be more thread safe due to immutable data structures.

Not all fp languages are purely functional, and certainly not all lisps. In fact, the only lisp that I'm aware of that focuses on immutability is clojure. Granted, many lisp programmers may decide to keep their functions pure, but it's rarely enforced.

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