Few, if any, drivetrain pivot systems are so beautifully simple. When the belt and chain rotate on the center axle it creates independence between the suspension and torque of the chain at acceleration. Zero squat, zero chain growth.
But the real story is in the minimal maintenance and ease of working on the bike. In fact, you can drop the jackshaft, remove the axle and everything else stays together. Boom! Simplicity. Change a belt, switch sprocket sizes and more with the greatest of ease.