It is my understanding that reducing the humidity during the flowering stage allows the plant to 'breathe' more easily. This means less surface area is required on the leaves but without a reduction in trichomes. So you are reducing the amount of vegetable matter but retaining the same potency. Therefore you should end up with more quality but less quantity. I think the plant uses trichomes to protect its flowers from frost, wind, heat, UV and herbivorous insects etc.