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I personally dont totaly agree that a magneto ignition must have the wires grounded I know electricity will take the path of least resistance but when the gap to ground is beyond the capacity of the coil the electricity is contained in the mag as the potential to ground is beyond the coils capacity. I have tested motors for 50 years pulling off spark plug wires etc.We ran a fishing resort for 49 years and probably hundreds of motors came home on one cylinder because the other was fouled. I never ever saw any electrical damage as a result of this.
With electronic ignitions there is a greater chance for grounding issues as the voltage is much higher and the sensitivity of electronic components