Would you buy a peeled apple?
We know the answer. A peeled apple turns brown within minutes. It oxidizes, losing its flavor, texture, and nutritional value.
Ground coffee is exactly the same.
From the moment of grinding, the clock is ticking. Within just 15 minutes, about 60% of the aroma (volatile gases) vanishes into thin air. What remains in the sealed bag is merely a "ghost" of the coffee that once was.

