Even cars are getting comically bad visibility. While there might be a big piece of glass bonded to the rear quarter, it’s got a huge black painted border on the outside and frit on the inside. Then there’s fat plastic trim that obscures driver sight lines from what is left.
NHTSA would be better off at having a visibility requirement for 5th and 95th percentile men/women. I’d allow cameras to play a part, but if used, everything in the system has to be warrantied for 10 years/100k miles (similar to emissions equipment).