The benefit is that by being standardized, there will be less proprietary cords and adapters. And the capability of USB-C should be adequate for sometime with the power and data transfer.
One issue, is that not all USBC cords are of the same quality. I found this recently when trying to find a cord that can be used for an external SSD, and video for a monitor. Some cords worked, the rest did not. All the cords could be used for charging, but after that, all bets are off.
That’s not how it works.