Nobody here has been more critical of Brulosophy's test methodology than me. But that said, I've long thought the experimental methods were actually rather good. They take pains to try to brew or adjust two batches keeping everything the same except the variable of interest, then see if there are any discernible differences. The whole idea is to remove all other explanations for the difference except one.
The testing part, not the brewing part, is where I've always had problems. No controls over who the population is, what they ate or drank beforehand.....the testing is just not very robust, and it introduces an explanation for differences besides that of the test samples.
But in the end, what Marshall does has no effect on my life. My beer tastes great; my family still loves me; he doesn't have access to my bank account. He's very straightforward in what he's doing, and the critical-thinking consumer of information can choose to accept it or not.
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I met Marshall at the BREW Boot Camp in March 2019. Nice guy--the sort with whom you'd like to sit down and have a beer. Not pretentious, just doing something in the beer area.
I'd brought a few bottles of my Darth Lager along for feedback from people. We were sitting around a coffee table in the lounge area and he had a half-glass of Darth. A few minutes passed and he said "Hey, let me have some more of that." But then, it was just him, and no comparisons.
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In the end, I've always thought this about Brulosophy: at least they're doing something. Is he making money from this? Sure. A lot? Nah. And nothing he does requires any money from me.
Very few of his detractors here--including me--are doing carefully-controlled experiments and then reporting on the results. At least, as Teddy would have said,
he's "in the arena."