Just discovered this video of Travel Assist in a Seat Leon.
It seems far more advanced than the "cutting-edge" Travel Assist in the ID3.
The display reflects the car's position in the lane as well as any curves in the road. Lane markings are animated on the display as the car drives past. Other cars move on the display much more smoothly and realistically.
I wonder when/if we'll see this version of Travel Assist in the ID3/ID4.