I never contested that "differences" between cables cannot be heard if the room acoustic is not treated and well controlled, the difference can be heard in ANY room with ani system...
I tested difdfrent cables before my scoustic journey and i always hear a "difference" ...
But a diffrence between cables is not the specific improvement of all acoustical cues of the system room...
What is an acoustical cue?
Timbre, dynamic., imaging, soundstage, LEV/ASW ratio, Bass clarity, all that is specifically and hugely differentiated and improved by acoustic treatment and acoustic mechanical control of the room... Each one of these cue is DIFFERENTIATED and IMPROVED not only lightly changed...
Cables cannot have either the impact of vibration mechanical control nor the same impact than the control over the decreasing of electrical noise floor of the house/room/system and not on the same level in my experience...
Cables make an impact but a small one compared to the three embeddings controls : mechanical,electrical and acoustical... For most people even a 1000 bucks cable is too much and way better invested in these other areas i just described...
Anyway you are not alone on this boat, most people cannot fathom or imagine it because they never experienced this the HUGE improvement created by the three embeddings controls...Especially acoustic....
I know i have read many audio threads and the same ignorance is evirywhere... I woud have never know it if i had not go through it by chance and by reading in acoustic...
Most people boast about gear brand name and cables brand name...
Why no system at any price cannot change my mind about this?
My 500 bucks system is not far behind ANY system at any price why?
Embeddings controls of the system/room...But my claim is unbelieveable anyway for those who dont have lived through the same...
I even cannot listen to any of my 8 headphones, they are infeirior on all acoustic count to this 500 bucks system...I begin my journey with headphones improvement...I will never listen an headphone again ... Do you imagine?
I do agree to your second point - however - in my years of designing and building cables I have found that the benefits of well designed cables can be heard even if the acoustice environment is lacking some acoustic treatment.