At that point, why use USB-C for the dock connection at all? Just use a proprietary connector if you're not going to follow the standards.
Having a separate USB-C port for charging should satisfy e.g. the EU regulations requiring that, I think. (Assuming that is the reason they used USB-C in the first place)
To satisfy charging expectations with the same port as display that they decided to do something proprietary with. On the flip side, why not do that when people will buy the console no matter what?
It's not