Except that it increases utility.
I can now bring a single charger that can charge my MacBook Pro and my iPhone. I just need a USB-C to USB-C cable and a USB-C to Lightning cable.
Charge my laptop or charge my iPhone or charge both (use the laptop as a passthrough).
It will reduce the amount of stuff I carry, I tend to carry just an iPhone charger while traveling in case I want to bring it with me where I don't bring my laptop, extra space in luggage and weight.