I honestly can't figure out what you're trying to say in the bolded sentence above.
As for everything else there are full range plus measurements of Audioquest cables against generic cables that show no difference in the signal they put through. No difference in bass, mids, or treble. Nothing at all to substantiate the claims anyone makes about fancy speaker cables. Claims that have never been substantiated in double blind tests either.
https://www.audiosciencereview.com/forum/index.php?threads/audioquest-go-4-speaker-cable-review.37308/
In short, if you want to try and tell people that you believe/perceive/get the impression that one cable makes pianos sound "glassy" in comparison to another cable you're definitely on the wrong site.
The cables vs cars analogy is stupid. If you want to improve the performance of your car you do so by upgrading the engine, the brakes, the suspension, the tires, etc. You don't get improved performance by changing out the wires going from your ECU to the engine.