Good coffee is grown on shady hillsides or in a field that receives only part sun. The beans grow much slower and absorb much more flavor from the cherry flesh that surrounds the bean. Cheap coffee is grown in full sun in fields; it grows much faster, but does not absorb as much flavor from the bean.
Most dark roast coffee is inferior beans because charring coffee to the point of dark roast eliminates the natural flavors and replaces it with charred notes. It makes sense to do this to inferior, less expensive beans, less flavorful beans.
Light roast coffee allows the natural flavors to shine and is mostly done on high quality beans for obvious reasons.
One more advantage to light roast = more caffeine. Caffeine is eliminated through the roasting process so dark coffee has less caffeine.
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