What Tesla said but not as detailed.
Isolated grounds were required back in the day to address the problems of noise on the bonding wires being interpreted by the computers as data. Computers have much better power supplies today but bad bonding and grounding still creates data errors.
Tesla Gives about the best explanation I have read and I think this time I even understood it.
The idea that the ground does not need to follow the circuit conductors might work fine for the data but the circuit breaker likes the ground to follow the supply wires to reduce the fault impedance.
