I literally thought of brown m&ms when I read your first sentence and have to say this way of thinking has to be some kind of mega baloney, no offense. I would be more concerned if someone actually spent time sorting brown m&ms because it means I'm dealing with people pleasers that waste time on nonsense, thus not having time for more important things.
As for the design details, the proof is in the pudding. If they sold well then the person with this idea understood the vapidness of his customers to the point of contempt. But I am reminded of how things like design evolve from being there to solve a problem to over time becoming the problem itself that needs solving and the actual focus. But I don't think this is a good way to deal with things.
Not baloney. Someone who thinks they can decide what’s important about a production, not the production designer or manager, is likely to draw the line at the wrong place. Someone who faithfully implements detailed instructions is more trustworthy. A quick way to check if that’s the case helps to determine which kind of person oversaw the work.
I used to work as a developer at creative agencies and saw this all the time. There were developers who had a hard time believing that they should implement designs to the pixel because they thought a bit of padding didn’t matter so long as they got the important items right. They were almost always the ones who ended up missing important details (copy, working forms, performant databases etc.)
From a systems perspective, the brown M&Ms are a "canary" (a.k.a. "sentinel indicator"). If a venue can't handle that or simply decides that it's "mega baloney" and ignores it, one can no longer assume that they've done anything competently, or at all.