WHY DO PEOPLE FEEL THE NEED TO COMMENT ON CABLES AND EQUIPMENT THEY HAVE NEVER HEARD?

Of course they cannot reasonably comment about the sound of the particular component, just as someone auditioning components via Youtube cannot reasonably comment about how the gear sounds. But, they can otherwise reasonably comment on the gear-- the design philosophy, the price charged, the lack of credibility of claims made by manufacturer or those reviewing the gear, etc. (everything but the sound).  It is reasonable for the OP to state his opinion that only the sound matters, but, others might reasonably disagree and think that minor details, such as the price, matter and that certain price levels cannot be justified no matter the sonic result.

Because they can. Welcome to the Internet.

It would be nice if we could see each poster’s system and have a sense of what presentation qualities they prefer and their level of immersion in this hobby, but that  rarely happens, so we each form a sense of who might be worth listening to and who to ignore.  Never trust someone that uses run-on sentences.

I totally understand. It depends on your preferences and situation design and science matters but sound matters the most.  My music brings me joy and piece. Yes I have an expensive system but I enjoy it. Some people like cars. I love audio 

but, others might reasonably disagree and think that minor details, such as the price, matter and that certain price levels cannot be justified no matter the sonic result.

+1

OP

Yes I have an expensive system but I enjoy it.

I don't see why anyone needs an "expensive" system to be able to enjoy their system? How is this relevant to enjoyment? Can you buy it?