To put finer point on it, incomprehensible code that "just works" should be put high up on the list of things to FIX, not "leave alone".
Honestly your "old saw" about "leaving things alone" is just POOR ENGINEERING PRACTICE.
Programs must be written for people to read, and only incidentally for machines to execute.
- H. Abelson and G. Sussman (in "The Structure and Interpretation of Computer Programs)
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