Not just trucks; cars, too. Crash safety standards have made them impossible to see out of. I have a small hatchback from 2000 that you can see out of amazingly well, compared to my wife's 2008 4 door hatchback which is harder to see out of. Higher tailgate, higher rear 3/4. Then I bought a 2016 hatchback which was harder, still to see out of. Now we have a 2018 sedan that's virtually impossible to see out of with the rear 3/4. Mirrors are great in traffic, but it's much more difficult to be confident that you're not about to run something over in a parking lot. This is why reverse cameras are mandatory - you can't see out of cars anymore.
The NTSB does seem to be a lot more interested in the safety of the folks inside the vehicle than those outside. This same viewpoint is reflected in using road design principles that make perfect sense for the highway, where there are no pedestrians, being use inside the city where there definitely are.
