Everything matter in the audio chain. Tests prove it!

Their measurements seem to be done at 11,0dBu level, which corresponds to 989mW on a 8-ohm speaker. Although the graphs are very dynamic-looking, they will fit into a leeway of 0.2dBu, which corresponds to about 40mW on the 8-ohm speaker.

Will that be audible? The author claims it will.

As Albert Einstein said , not everything that counts can be counted.

Technics showed a graph over 30 years ago on one of their integrated amps 

and a pretty clean sign wave, vs a Airtight. Vacuum tube model . And stated Vacuum tube  is now obsolete , sonicly SS equipment at the time under even a bit of distortion was gritty and bright ,where the vacuum tube rolled off with even harmonics and smoother , SS amplification has come along way in 30 years and sounds very musical  , graphs  are good but don’t tell the whole story ,

also your Room can play a huge part of the equation  damping the room of 1st reflections ,bounce reflections ,Bass nulls  treating your room  should be on your short list.

YES and NO!
Not everything can be judged by the tech, BUT neither can you trust your ears. What you like is totally subjective and opinionated at best. Most people have never had the opportunity to sit on a stage with a live jazz band or in a parade with a drum and bugle corps. So you end up with people talking about things being too bright, when all they are noticing is Probably their first experience of hearing a trumpet as it sounds live, or noting the difference between a Steinway vs a Yamaha grand piano. The Tech is there to give you a starting place to visualize what you are hearing and is not meant as an end-all. Also as noted as time goes on, the industry will find more and better ways to present music to our anxious ears to hear.

Anyone going to extremes on wither side of this argument is less than truthful and making uneducated comments.

Thanks for the Alpha Audio link. Will require further study but I've wondered why this hasn't been done before.

I have always been a firm believer that everything in the chain counts, and contributes,  the key is finding the right components. One should take deliberate care and do their due diligence but inevitably one may take a step backward. Data like this can help in the decision process and it is only one part of the equation.

Yes acoustics are a huge part and some of us have well treated rooms and others just throw a blanket over a tv or window and call it treated.  Some do nothing and use REW software and think they are good.

But combine all of these elements and it could be audio nirvana.

Don't blindly dismiss something as Snake Oil if you have never tried it. Yes the bottom line is how the system makes you feel and your interpretation of the pressure waves being sent to your ears. Music is emotional and so is this passion we have for audio and the equipment we place in the chain.