The bottleneck was such a bad way to nerf MC's cheat. Physical bottleneck happens cause the person lacks spiritual energy or quality of spiritual energy. MC's system literally gives him unlimited amount of it. So this bottleneck shouldn't have existed. Other bottleneck is spiritual type where they need to comprehend Dao or certain principal, this bottleneck is obviously not the spiritual type. If author just wanted to nerf MC, he shouldn't have given him such a powerful system in the 1st place.