Being something of an audiophile myself (I have a relatively modest £10k Naim CD, streaming and amplification system), can I assume that your comment about expensive audio cables is based on your own personal listening experience or is it just your opinion?
Trust me when I say that (some) expensive audio cable can and do make a big difference to sound quality, of course they have to be used in an appropriate system that is capable of resolving the detail in the first place.
As an example, Naim produce a 1 metre interconnect that is priced at £1600, a lot of money for sure, that I couldn’t justify in the context of my hifi system, but I have had a demo of that cable (using a Mario Bondi CD - This is what you are), the improvements in sound quality and detail resolution were indisputable. I don’t have ‘special’ hearing abilities. I went to the demo as a cynic and took my even more cynical son with me.
The demo was as part of a £30k system, so £1600 for a cable is fully justified in that context - if you are wealthy enough and are happy to blow that amount on hifi.
Your comments around the Technics turntable are spot on, it’s a great all rounder for any application.