When you're dealing with suspension it's a three-dimensional deal. As mentioned in the article, the ball-joint flip is primarily to maintain proper alignment after a lift. The added benefit is increased down-travel on the suspension. The purpose of a spacer is to maintain the alignment if the amount of lift exceeds the adjustment made by flipping the ball-joint. As long as you maintain proper alignment your handling won't be affected other than the normal results of increasing your center-of-gravity.