The effect of fines being bitter and the coarse being sour is easy to test. Take a decent grinder and your favorite coffee. Grind one batch a couple notches finer than usual. Grind another batch coarser than usual. Brew both with the same amount and temperature of water for the same time as you normally would. Compare the flavor of both brews. This is a common step of "dialing in a brew" to get your preferred flavor. The finer grind tends to be more bitter, the coarser tends to be more sour.
Now take a bit of both grinds and mix those together and brew them. You will find it is both bitter and sour.
If you want to avoid placebo, simply perform a double blind test.
James Hoffman has plenty of videos demonstrating this, even on himself. He tests many methods, machines, and beans. The things the community says matter he can reliably detect in a double blind test. Other things typically show no effect.
Don't forget, this isn't just Reddit. People have been brewing coffee for centuries. There are many professionals and lifelong tradespeople. There are definitely things that matter for making a good brew and particle size is one of them.
>Grind one batch a couple notches finer than usual. Grind another batch coarser than usual.
You are giving me advice as though I havent been "dialing in" my coffee for over a decade. Of course if you brew two different coffees with 100% different particle sizes, you will get different results. This is an exaggeration fallacy. It is not the same test as having 95% of one particle size vs 5% of another, which measures the improvement you might get from upgrading a $50 grinder to a $200 grinder.
>Don't forget, this isn't just Reddit. People have been brewing coffee for centuries. There are many professionals and lifelong tradespeople. There are definitely things that matter for making a good brew and particle size is one of them.
Yeah, people have been brewing coffee for centuries. No, people have not been concerned about minuscule differences in particle sizes for centuries. The ethopian method still consists of roasting beans in what basically amounts to a cast iron pan. Dominicans still roast their beans in sugar over a fire. Both have been grinding their beans using mortar and pestle since the beginning of time, and continue to this day. Would you scoff at those, and tell them their coffee is not "dialed in"? I'm sorry, but the pretentious exaggerations over coffee particle sizes absolutely are a recent phenomenon, and that you are seriously suggesting history in support of your claims reveals an obvious level of naivety.
EDIT: Also, you should be extremely wary of "learning" from well-edited videos of taste testers such as James Hoffman whose entire livelihood depends on being a coffee personality in a world where coffee is touted as being more complex than it actually is...
Now take a bit of both grinds and mix those together and brew them. You will find it is both bitter and sour.
If you want to avoid placebo, simply perform a double blind test.
James Hoffman has plenty of videos demonstrating this, even on himself. He tests many methods, machines, and beans. The things the community says matter he can reliably detect in a double blind test. Other things typically show no effect.
Don't forget, this isn't just Reddit. People have been brewing coffee for centuries. There are many professionals and lifelong tradespeople. There are definitely things that matter for making a good brew and particle size is one of them.