Electrical engineering always allowed for free energy circuits by renaming them: unstable. In other words, "energy IN does not equal energy OUT" defines an unstable circuit in which you can't predict the output based on the input, alone (ignoring the ability for a shift in time due to electrical reactance disqualifying Conservation of Energy under Noether's Theorem). Thus, Conservation of Energy is not a law so much as it is a yardstick by which circuit topologies are measured to determine a circuit's type. If a circuit's output is unpridictable (based on its input, alone), then it is unstable since its output was not conserved within the boundaries imposed by its input. Type-casting is not disallowance; it is merely prejudice.

Considering how unstable circuit simulators are (due to their consistent use of matrix algebra as a shortcut for calculating a circuit's outcome), simulating an unstable circuit within the context of an unstable simulator yields "matrix is singular" error messages more often than not. Only stable circuits yield predictable outcomes. Simulators find no fault with these types of circuits.

Using an inherently unstable simulator to calculate a circuit's behavior is a predisposition (ie, prejudice) towards favoring stable circuits since only stable circuits will pass through this artificial, manmade act of filtration without coughing up and freezing in mid-stride. This is not due to some Law of Nature. It is due to flagrant social engineering.