" If people really understood how power supplies work, there would be far fewer sales of expensive "boutique" power cables."
If people relied on their ears rather than what they imagine they know, there would be significantly more "boutique" power cable sales.
BTW, I understand perfectly how power supplies work as I have built many, many audio components. Anybody who believes a power supply that produces noise free DC has ever been built, I have a bridge to sell you ... and I'll throw in a date with the toothfairy.