Granny,
I get that one can tell a difference between wires , interconnect and speaker cables that is - power cords - well - if of decent gauge and with quality connectors - then not so much. I can certainly also agree that proper mechanical isolation of components is important, and yes stuff breaks in.
I'd put power supply capacitors right up there with my take on power cords i.e.. if they are of good quality and properly installed then I doubt if anyone would be able to tell a difference between a blue one and a black one, never mind how golden eared one are.
Good listening
Peter