Okay Amir, obviously you are trying to compare the finite with the infinite. Plumbing equipment can be tested for their intended purchase, absolutely, just as aviation equipment must be tested and retested and hopefully not modified due to in flight failures. So your plumbing analogy is wrong and made to sound stupid as a comparison.
Sound and music are infinite. Hence, even the most exacting computer modeling of the most expensive concert halls results in failures. The Elbphilharmonie in Germany is that $850 million hall. The truth is that shoebox configured halls that seat under 2,000 people sound best and used zero computer modeling from the 19th and 20th centuries.
I want audiophiles to use common sense and logic by learning to listen to sound and music, not just use measurements as their guide.
I have friends with $500k to $1M audio systems. I wouldn't own their systems. They are pleased with them (one I now enjoy listening to). However, the $1M audio system owner is constantly changing equipment because he is unsatisfied with it. There are parts of their high end systems that I like. The $1M system owner dumped $68,000 in High Fidelity cables and purchased GroverHuffman cabling for about $4,000. After hearing the difference of course.
The $500K system owner chose to change the 6H30 tubes on his Audio Research SP 28 to 6N6 (6H6) tubes. The result was fantastic. He was also an electrical engineer and thought power cables were all the same despite his higher end ICs , digital and speaker cables. He replaced all six of his Pangea power cables with GroverHuffman power cables after just lending him one power cable for his amp. Since we live a few doors apart and enjoy a wide range of music, we visit each other and can now enjoy music together (but not prior to his major 2 changes in 2022).
This is not an advertisement for GroverHuffman cables. Just, one must listen to alternative equipment in one's own home to make a qualified decision, like an A/B test at a Harman Kardan factory (which is about 5 miles from me).