“Blindly following” It sure would be hard to swap components if everyone was blind

being color blind is hard enough reading resistor codes! Upside is that I have to measure every resistor anyways
“Wouldn't it be nice to KNOW what parts offer a specific tonal flavor”
yes, it sure is nice
“and WHY, when you decide to build a new amp?“
as outlined in previous comments on the forum by our members, the necessary resources to achieve this ideal scenario within a concrete scientific method would surpass the financial constraints of most people, let alone poor old me. Rather than investing all my time and energy into proving to others what a pair of working ears can inevitably discern , and then undoubtedly still be doubted and denied, I will just keep building amps using based on accumulated experience to achieve predictable results , and if I want to try something new then I will simply try it , as you said : without blindly believing and following dogma
So back to the question: what did you think when you have conducted these testing methodologies ?