The most common error of a smart engineer is to optimize a thing that should not exist.
Laws and adages
Conway’s law is an adage that states organizations design systems that mirror their own communication structure.
Tesler’s law, also known as the law of conservation of complexity or Waterbed Theory, is an adage in human–computer interaction stating that every application has an inherent amount of complexity that cannot be removed or hidden. Instead, it must be dealt with, either in product development or in user interaction.
Haitz’s law states that every decade, the cost per lumen (unit of useful light emitted) falls by a factor of 10, and the amount of light generated per LED package increases by a factor of 20, for a given wavelength (color) of light.