Water can attack and damage wood siding. Stucco walls crack when the house shifts as winter rains expand soil. Metal siding dents easily. Vinyl siding pits as it oxidizes. Even bricks chip and crack with winter freezes and summer ground settlement.
No surface is perfect; no material perfectly withstands the rigors of nature and the force of the elements. But you can do a thing or two to add life and beauty to your home's siding.