You got the usual response from the folks who have crap for audio systems, can’t be bothered to try, or have genetically inferior hearing.
That said I think you have left out a lot for other factors on cable break in.
One of many others that can’t ignore is that electrons are physical particles and are charge aligned as they leave an amp. .
flowing thru a cable with metallurgical imperfections will cause the electrons to bounce around and get displaced in relation to each other. Overtime some level of these Imperfections will get smoothened out just like water will do to rocks overtime.
This I also believe is another factor for break in. I am sure there are more reasons causing us with better audio systems and ears to experience cable break in differences.