If they surveyed and found bad hearing caused many accidents/deaths as it did with vision problems(glasses) they could pass a hearing test in the drivers test to remove bad hearers from licensing?
Maybe don't exclude people with bad hearing from driving but do require people whose hearing can be improved with hearing aids to wear them while driving.
Wouldn't rolling down the window provide superior/cheaper situational awareness?
Agreed. I like to roll my windows down when driving in unfamiliar neighborhoods (weather permitting). Lots of audible cues can add context.