How does a 6' flexiable cable counteract the effect of voltage drops when high power appliances are turned on?
Impedance will cause the voltage to vary from one second to the next, with significant drops at the times when ovens, electric water heaters, and electric dryers are turned on.
Additionally there is measured the distortion on the mains in anyone's house of greater than 5%, and there is absolutely nothing that a cable can do to change this, regardless of cost.
Your quote is quaint, "removing the harm". Indeed. To remove the harm, given that the mains is distorted, and varies in amplitude from minute to minute throughout the day, and has significant impedance, requires a UPS, which (if you get the right type) uses the incoming mains to charge batteries, then uses an inverter to supply power to your equipment.
In subjective audio comparisons the 'correct' answer is always the more expensive or inconvenient one. I am afraid that lectronics is rarely as simple as that.
A major improvement is more likely to be linked with a new circuit topology or new type of semiconductor, than with mindlessly specifying more expensive components of the same type.
To make the point, cars do not go faster with platinum pistons.
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