However, roasting coffee dark does homogenize the flavor of the coffee, and you do lose more and more of what that coffee tastes like. Coffees have a ton of different flavor compounds, and no two coffees are the same. There are quality issues and processing issues though that don't help to highlight this too, so it's hard to find coffee - even from people who know how to roast - that can shine in this way.
I think everyone should try a good coffee that has some punchy flavors - I'm not saying everyone should like it. It's a fun thing and should be experienced if you're interested.
Applies to vegetables and other vegetarian foods, too :)
Ever tried eating raw wheat, rice, pulses or vegetables? Only some vegetables are okay in salads.
Overcooking and adding a lot of spices makes everything (more or less) edible. With less cooking and less spices, you can better taste the original ingredients.
I'm sure you will agree that raw beef and a steak taste differently?
I am not a expert on the science of cooking, these are just my casual, slightly scientific observations as a layman :)