There are many options and some are more expensive than others. The key benefit is largely invisible, just like this standard. Specifically, it allows more competition leading to lower prices for everyone. In addition, adapters become redundant which is another substantial cost for anyone travelling. Assuming half the cost is saved and q rolling adoption, it will pay for itself within half the lifespan of outlets and appliances. This obviously won't be 1 or 2 years but neither is the case for the USB-c standard.