Copper vs Hybrid differences

your speakers, their placement, and your room will ultimely flesh out the detail you desire. the buils quality of cable is more important than conductor type, price, and claims of hearing things never heard before. your system should sound balanced from top to bottom. if you own great loudspeakers the details will be there with lamp cord(not a recommendation though).

"Hybrid cables are too lean, harsh, and bright, IMHO"...

MHO is different from yours, Audio Girl.

My AZ Matrix Ref mkII interconnects do not sound lean, harsh or bright at all, despite the fact that they are hybrid. I don't know about hybrid speaker cables, but I agree with Audiofeil. Design and construction...

Raw material choice does not always translate to sonic signature. Here is may take: 80 to 90 percent design and 10 to 15 percent purity of the material.
I personally use all silver cables for my setup and they sound very liquid and full without any harshness.
On the other hand, someone I know use all copper and they sounded harsh and dull and lack of transparency.
I've tried his cables on my 2 different setups and got similar result.