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 for aeroplane rule
From The Free On-line Dictionary of Computing (30 December 2018) :

  aeroplane rule
  airplane rule
      "Complexity increases the possibility of failure;
     a twin-engine aeroplane has twice as many engine problems as a
     single-engine aeroplane."
     By analogy, in both software and electronics, the implication
     is that simplicity increases robustness and that the right way
     to build reliable systems is to put all your eggs in one
     basket, after making sure that you've built a really *good*
     While simplicity is a useful design goal, and twin-engine
     aeroplanes do have twice as many engine problems, the analogy
     is almost entirely bogus.  Commercial passenger aircraft are
     required to have at least two engines (on different wings or
     nacelles) so that the aeroplane can land safely if one engine
     fails.  As Albert Einstein said, "Everything should be made as
     simple as possible, but not simpler".
     See also KISS Principle.

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