Who says cables don't make a difference?

Chord company, Moon audio, Morrow cables, etc they all experience break-in for diverse electronic components and cables...

I experience it myself...

We are all deluded....Say those who dont experience it, dont want to experience it ,even if this could be possible, so strong is their faith in their "understanding" of electronics.... Fact cannot pierce blinders....

Debunker are tedious....No explanation can contredict a fact, that is at the basis of many working audio company.... Marketting tactic some say....

But there exist not only the testimonies of many people, customers or designers, but many reasons why break-in can be real ...

https://hometheaterhifi.com/editorial/hi-fi-audio-component-break-in-burn-in-fact-or-fiction/

This article explain some and the writer seems very competent scientist to me....

For sure this prove nothing, but i am a bit tired by the stupidity of cables threads, cables break-in threads and vinyl/digital threads, etc...

A bit of common sense suffice to reach a conclusion....It is useless to create debates about these matters....

Sorry for my rant.... 

Is there any data that supports the gain or loss of quality?

Another one who think that data completely replace reality.....Read the article i just post there is some data that go in the way of the break-in hypothesis....But there is no ABSOLUTE data that will replace reality and the experience of many people for the time being....

Ok i quit for the night... :)

All of this is subjective right?

No not all break-in are subjective experience only, amplifier or dac break-in exist base on the working cycles of some of their electronic components... Read the article....

Good night....

In engine break in there is a component (the rings) that literally moves to find the best spot. Care to tell me what "moves" in a cable during break in?

Would it matter? Even if they did the naysayers will explain it away as they’re 10 percent nickel to iron, vs 5 percent. Or they’re gapped incorrectly, anything to keep it going. Why do they work so hard to try to convince anyone who will listen. I hear what I hear, and don’t care to convince anyone that they should also, whether i did or did not hear anything. Why should I care if someone can hear a difference, or not? If someone wants to spend because they feel it does make a difference for them, I have no objection to that. If you don’t hear anything, then there’s no need to spend. Everyone can be happy, so why is it that the some of the ones who can’t hear feel the need to rain on someone else’s parade. 

Care to tell me what "moves" in a cable during break in?

Electrons, copper molecules ... to name a few.  And they move because of heat and friction ... just like the cylinder rings changing its property due to heat and friction.