Lots of good uses for it technically
I am going to ignore the privacy issues here, because they won't be addressed. It just rolls out and screw your privacy, every time, and complaining about it never achieves anything, because the people complaining aren't the ones making fat donations to politicians. So setting that aside...
From a technical reason there are lots of good reasons for this:
- Cars ahead can warn cars behind what's coming up. Car stopped in the road or just a ladder, everyone knows to avoid the second lane right here. Or maybe 'dog in lanes' or 'mountain lion in lanes' could save some animals.
- Cars can pack much better and change lanes much more smoothly when everyone around knows what all the other cars want to do. Imagine everyone just doing a zipper merge seamlessly at speed, alternating flawlessly without that arsehole in the Mercedes just crashing in without his turn signal (since Mercedes don't have functioning turn signals, based on observed behavior).
- Cars in a 'train' get better gas mileage.
- Everyone gets the fastest route to their destination given the other traffic (aka Waze). Some of you go this way some of you go that way.
- If everyone had this you wouldn't even need traffic lights. Traffic would never need to completely stop ever again. This almost ends traffic jams, and definitely ends stop and go driving.
- This is also the end of accidents barring things coming in from outside the road or physical issues or letting Teslas join in with their terrible 'self-driving'. But even if there are, then traffic behind knows about it and flows around without issue.
Yes, this is boring compared to current driving if you actually like going for a drive, but I'm fine if I can just read or watch a TV show or whatever. Most driving is formulaic and sucks. It also defangs the defective mercedes drivers and the young males weaving in and out at high speed because they've seen a Fast and Furious movie. I'd be fine with my car just getting me there if I don't have to pay attention at all.