For your analogy, food is good because the recipe and ingredients are good. Not because some reviewer says so. Electronics are the same.
But you are missing something critical: Ingredients are not just ingredients, the source or quality of those ingredients matter. If someone thinks they can just get "the recipe" for chocolate, slap some cocoa, butter, sugar and milk together and end up with Cote d'Or they are sadly mistaken, and many know this from experience. But did they ask to have it tested or measured after cooking? No, that would be silly; they just tasted it. Please, tell me a "food testing machine" that can measure the quality of chocolate to take the subjectivity of tasting it out of the question. Same with wine. Or your favourite spirit. Or beer. Oh wait, I got it: your mouth. Who claims they are all the same, and buying chocolate from Belgium is snake oil, and those chocofools wasted their money. Nobody, they would be ridiculed.
When it comes to construction or metal composition in a speaker and the money someone pays for quality somehow this process is different?