Why is there acenter shock on a79 dirt bike?

Why is there acenter shock on a79 dirt bike?
The mono shock design removes the two outer shocks that were common on older dirt bikes. The design uses a larger, usually gas shock and sometimes a spring mounted to the frame and swing arm. Centralizing the shock reduces twisting of the frame and affords a smoother ride. It also gives less items to be snagged in a trail situation since the shock does not protrude. Some also allow the seat height to be adjusted for shorter or taller riders.