I don't think it's judgy...
Take an amp with a Fender tonestack architecture and compare with an amp using a Baxandall 3 band architecture. It would take a lot of work to get one to sound like the other, and depending on the deign choices it may likely be impossible. I say this as an amp designer, not a video influencer.
In the video, Jim
did get 3 very different guitar amps to sound nearly identical. It did take a lot of research and work, and extreme EQ settings. But...
Jim isn't trying to prove that "all amp heads sound the same."
He's trying to determine
why they don't all sound the same.
His point is that 4 components that are frequently and vehemently proclaimed to make the most difference for guitar amp heads -- bias type, rectifier type, preamp tube type and power amp tube types -- are not what makes one amp different from one another. He found equipment where he could easily isolate those specific functions and keep every other parameter the same, and found that it made little or no difference.
After further testing, he concluded that what makes the biggest differences are:
• The sequence of EQ and gain/distortion stages
• How the EQ dials are configured
As a result, he was able to very closely match the sound of 3 very different guitar tube amp heads, by:
• Varying the order of EQ and gain stages
• Varying the EQ settings
• Using the same cabs as the original
• Using solid-state boost pedals instead of tubes for the gain stages
Seems pretty solid....