@amir_asr You are such a know it all. Such a foolish person. I don't why I answer except you are on Audiogon lecturing us.
My neighbor and friend was ashamed of his system when I lent him ONE power cable for his amp. He had the habit of changing gear on a regular basis, including a loss of $22,000 on a D'Agostino amp that he paid $46,000 for. I heard it when I first moved in in 2019 and found his system so distant and thin sounding on my CDs that I told him I had never thought of those recordings sounding that way. He came over to my house and heard my "lowly" system (he is also a gentleman and did not criticize my system either) and was astonished that the same recordings had so much color and dynamics. He also thought other visitors were just being kind and wouldn't criticize the sound. This is an electrical engineer with a net worth of around $40 million self-made in real estate, not a stupid person,
It took NO time to tell the difference once all fiver or six (I forgot) of his Pangea power cables were replaced with GroverHuffman cables. Furthermore, my pre-amp was substituted for his Audio Research SP-28 and walloped it. He decided to change the input tubes (6NG/6H6) as suggested from another audio engineer friend and that resulted in sound very similar to my pre-amp. THERE IS NO NEED TO MEASURE OR BLIND TEST OBVIOUS SONIC DIFFERENCES THAT ARE SUPERIOR. You don't get this so stay off the Audiogon site. My friend is so happy, he can hardly contain his joy and like me, listens at night for 2 hours or more.
You are the condescending person, not me. I don't ridicule friends who just want to hear music, imperfectly or with really old equipment that may need maintenance (like old caps). Many of my friends are musicians, singers, orchestral players and audio engineers. I often praise friends telling them they made good choices years ago who have older Marantz, Fisher and Yamaha gear for their musical sound, tube and solid state.
Mid-fi isn't a price, its an execution of audio fidelity. There are so many great older mid-fi equipment pieces I've heard. Even a lowly <$75 Sherwood 7100 receiver is mid-fi in my book. Hook it up to a Legacy Signature III and enjoy beautiful sound. Cabling can make a difference for mid-fi equipment.
Saving people from foolishly spending 10X on cabling, etc. compared to their equipment, especially for less than mid-fi equipment is a mitzvah/a good deed. I remember a friend 30 years ago who wanted to purchase a $3000 CD player to go with a Pioneer 1970s receiver and Onkyo speakers, hooked up with the cheapest RCA ICs and lamp cord. What a mistake in spending money that would have been.
AND finally, I 100% disagree with your assessment concerning cables and tweaks. I say that I'm right. Most manufacturers of quality audio equipment say that I am right. They suggest and often urge customers to purchase complimentary equipment and cabling to extract the maximum from their equipment. They often design special footers for their equipment, anti-vibration chassis, etc. I've read an ASR forum where the members spent pages excoriating a member when he used an anti-vibration platform under his amps. If it worked for his equipment, why not? It may not work for others but maybe it did for his system.