Do all cables sound the same? Uh no
Do measurements tell the whole story? Nah
Are most cables a variation on a theme or at worst, new age snake oil? Most, some more than others
Are there manufacturers who have been around since the beginning of the High End audio cable markets inception? Why yes there are…specifically MIT and Transparent. They were music lovers who wanted to improve the way audio signals were propagated from one component to another. They used science and experimentation to improve signal transfer and increase their enjoyment of reproduced sound. These cables do sound different, but most of all, they deliver cables that can allow anyones system to sound more realistic, more dynamic and full of life with superior low level detail, a richer more textured midrange and deeper, more well controlled and defined bottom end.
So is wire just wire? Kinda, unless your using cables that are purposely designed to enhance the transmission of the delicate audio signal you might as well use coat hangers.