"But it's really pretty cool knowing that there is an extra set of eyes always watching the road ahead."
While it's not saying they specifically 'need' one, it's implying that it's good to have one...I'm saying it should be unnecessary, even theoretically.
Why? Especially in heavy or crazy traffic it is nice to have someone else with me to keep an eye out. Just like when I fly I generally like having a co-pilot there to help look for traffic.
I don't want it acting on stuff it senses but I do want it to notify me.