We could look at it scientifically. All the power cable needs to do is supply a constant voltage at a single frequency.
The only possible benefit of using high end power cables is when shielding is employed to reduce EMI emanating close to equipment, which is absolutely worthwhile and indeed crucial.
Interconnects are entirely different as all frequencies need to travel at the same speed at widely varying voltages with high speed voltage changes. As with power cables, adequate shielding is critical but it needs to be connected to a central earthing point rather than introduced to one side of the signal, especially when unbalanced (not doing so is relying on antiquated inadequate techniques). Get that right and you are on the way to a fantastic system.
The only possible benefit of using high end power cables is when shielding is employed to reduce EMI emanating close to equipment, which is absolutely worthwhile and indeed crucial.
Interconnects are entirely different as all frequencies need to travel at the same speed at widely varying voltages with high speed voltage changes. As with power cables, adequate shielding is critical but it needs to be connected to a central earthing point rather than introduced to one side of the signal, especially when unbalanced (not doing so is relying on antiquated inadequate techniques). Get that right and you are on the way to a fantastic system.