The fact that you cannot rely on theoretical values alone is one of the difficulties we face with naturally-derived raw materials. No matter the number of scientists or specialists, the humidity or temperature on that day, the season, or the time, etc., there is nothing as keen as the human senses. The five senses are used to capture subtle daily changes in scents, colors, and other factors and stabilize quality through delicate adjustments. Although it may come as a surprise, we place importance on such analog senses.