The Varia works great for me.
The only shortcoming is it doesn't (or cannot) distinguish between my wife closing in from behind on her e-bike, a safe car driver, and a psycho in an FUV. If the AI aspect of this prototype can differentiate between those, it is a significant advance that I would pay for. The idea that a rear camera would record close or threatening vehicles preferentially is an added bonus. Garmin could license the technology for a future Varia, or develop their own version.