I guess for a prototype CNC fiberglass makes more sense than moulded plastic, but in a production run mould costs would be covered easier. This might provide the answer for avoiding the special technology needed to insert the balls in the arms which must be time consuming to do for each arm when you have to make zillions of them.

The toe is dynamically variable which basically means the loaded wheel will have more toe which should help cornering. The problem might be with squat which will induce more toe, therefore slowing the car down.

I sure hope we'll see this car on the track soon.