Another thought is that in order to publish performance data and avoid litigation, manufacturers must maintain a test lab’s certification and calibration and possibly have their test results certified by an independent laboratory. That is not cheap. It likely becomes a business decision of cost/benefit. Unlike U-tubers who do their off the cuff tests with possibly uncalibrated/uncertified equipment. At least I have not seen any of them publish their certifications in the footnotes or in their videos. And furthermore, they should state that their data is for reference only.
Another thing about power conditioners that I found with regards to audio performance is that power cables still matter. I bought my Niagara and Hurricane power cord and experienced a significant improvement in sound. No question there. My front end components are plugged into the PC, not my amps. So I assumed that my good, not great power cords on my DAC and preamps were good enough. After all, for this kind of money this PC should have been the end game- or so I used to think. When I decided to try a higher level power cord on my DAC I was both surprised and disappointed at the improvement it made to the sound of the DAC. This higher end power cord reduced the noise floor even more as well as making the DAC sound even better. Now I had to upgrade the power cords on my preamps and the better power cords improved the sound. So don’t expect the power conditioner alone to do it all for you.