They're not on the same scale. It does improve both, but it improves isolation to a much much larger degree. It also makes the world inside significantly differ

They're not on the same scale. It does improve both, but it improves isolation to a much much larger degree. It also makes the world inside significantly different from the world outside, so it takes a different knowledge base to be able to program effectively. Particularly if the inside is an OCaml program, tbh.