Not everyone with a dedicated line uses AC line conditioning, expecially when sourcing a power amp. Ask Mike VansEvers if you must understand the physics - I trust him unquestionably & certainly won't be arguing so help yourself. Whatever the electromagnetic phenomenon, this is what he recommends for a quieter dedicated AC line & for connection into a line conditioner. It works too. If you don't want to do this then don't, it's your loss, but don't go posting misinformation that this is ineffective just because you don't understand.
There are many things that we do but don't completely understand all of the reasons why; there's really no need to. Another example: it's no problem driving an automobile even if you don't understand everything that's going on under the hood.