This process leaves the product with very little of the original aroma and flavor.
Salt is also a much cheaper product to use as the primary seasoning ingredient.
The vast majority of seasoning blends available today use more salt than any other element. Hot air drying also makes the herbs, spices, and vegetables extremely difficult to rehydrate. At the market you will find more flavored salts, than anything else on the shelves. If the first two ingredients on the label are salt, you're health and your pocket book are getting ripped off. If you do happen to find a product that does have herbs, vegetables and spices in them, they have almost no aroma and are tasteless except for the bitterness.