Your gutter's primary duty is to carry water away from your building, into either a drainpipe or into a water handling and storage system. Without sufficient guttering, water can infiltrate into crevices and enter inside your home, causing major flood and dampness damage.
Water can also pool near your home's foundations, causing major structural damage. As long as your gutters are maintained properly, they should do an adequate job of draining this water. Gutter blockages are extremely common, and you will have to conduct extensive gutter cleaning that requires continual maintenance to function correctly.
Cleaning a gutter filled with leaves, twigs, and debris is a pain, especially as the rainy season approaches. It is vital to maintain your gutters regularly to keep things in good operating order. While it is vital to clean your gutters regularly, the risk of accidents when clearing your gutters is a disadvantage.