[userbinator]

It's a protocol they designed, so they could do whatever they wanted between the initial linkup and carrying data, including link training.

but denying the complexity of the problem space can be a hint that you don’t sufficiently understand it

...or that I understand more of it simultaneously to see that it could be made much simpler.

[lxgr]

They did in fact not design all protocols running over USB-C, as I’ve mentioned.

This allows it to work with other ports without putting a complete link speed protocol converter into the cable or adapter.