*Blind Spot monitoring
I'm sure I'll get flamed and flogged for bringing this up, but I have had this discussion many times. If done correctly, most cars do *not* have any blind spots (rear view.... A pillar is a different story). There is an actual SAE standard for adjusting your mirrors that apparently no one knows about or was ever taught in driving school.
Here is an article from 2010 talking about it:
How To: Adjust Your Mirrors to Avoid Blind Spots
I've followed the SAE adjustments on many of my vehicles and it's amazing how *poof* the blind spots are gone. I wouldn't consider buying a car that can't adjust its mirrors appropriately. I've sat in cars in dealerships and if their mirrors can't go out far enough, I move on to the next car. First thing I did when I sat in a Tesla at the mall was see if the mirrors could be adjusted correctly.
I ride a Honda CBR motorcycle, so believe me I'm sensitive to people not seeing me. But I'd rather people learn how to use their mirrors properly than some light that may or may not come on.
You can't be looking in all directions at once. And things can happen in a fraction of a second when not looking in the correct direction that you didn't expect. You can do everything "right" and still get burned. And sometimes, on occasion, humans make errors.
And no, I don't want just a stupid light to blink like my Chevy Volt Blind Spot (useless). I want a Chime if my blinker is on and something is potentially in my path for any period of time I have that blinker on like my Jeep did (or most other brands do). The whole point of the Chime is you might not be looking at your sideview the moment something might be a problem. You might be checking in front because it's a construction site and lanes are being merged for example and it's a game of chicken everyone merging. I'd like something watching the side view while I'm watching the Cop directing traffic or other cars cutting in front.
Rear Cross Path and a good implementation of Blind Spot just gives you "more eyes on the road", which never hurts. Unfortunately I was only given one set of eyes and they are kind of linked together. If I have a passenger, they are automatically given a job. When I backup, I ask my wife to watch the back up camera while I watch the mirrors. It never hurts to have more eyes. *sugar* happens.