Re: They kinda do and kinda don't
"I have driven thousands of miles on ACC in my Volvo, which uses a camera-radar sensor combination, "
My Ancient lidar system just beeps its head off for 5 seconds if sunstruck and shuts off. No braking but you're now coasting.
As a safety precaution you have to switch the ACC off and back on again to reactivate it (It stops people just holding down resume even if the sunstrike is still present. This is a deliberate design decision from the chaps in Swindon)