The point is to have a “pure” profile of an actual amp.
“Pure” means as close as it gets.
Why: to explore the actual tone and possibilities of multiple amps, set them up on my own.
Like one user mentioned, two different Fender Vibrochamps can sound completely different to one another due to component variance. There in fact is no "pure sound" of any amp model - there is no "pure" Fender Vibrochamp sound. Only thousands of variations that all sound very similar but still have a difference. How do you determine which single amp represents the "pure" sound? You can say that "whatever averages between all of them" but that's a statistical thing. When you capture an amp, you capture one amp. There is no computing process that let's you create an averaged profile based on 30 different Fender profiles to isolate what's shared between them.
There is a pure schematic and list of parts for how to put the amp together. But following it step by step doesn't lead to a "pure" sound. There still is the +/-20% possible variance from one example to the next.
This is a dead end journey. Running different pre-amps through the same power amp makes the differences between them less noticable. Running a single pre-amp through different power amps makes that single amp sound different in each scenario. The idea of this singular, explicitly defined "signature sound" doesn't exist so chasing it will yield nothing. It maybe sounds condescending to tell you to just find sounds you like and don't get hung up on how accurate they are to whatever they are named after, but that's actually solid advice. Find profiles you like that don't all sound the same and play around with them and you'll be doing exactly what you want to do.