The final goal of Magento 2 One Page Checkout is minimizing the abandonment cart rate for every e-Commerce sites to help store owners increase their revenue dramatically. According to Global Abandonment Rates reported by http://www.salecycle.com/, by June 2016, 74,52% of global customers leaving their carts instead of finishing the purchase. Why is 74,52%? The main reason is making customers wait too long time for the checkout process. The amount of the abandoned cart wastes trillions of your revenue, that is a huge damage in the business.