I think you're right about that, and I also don't think car designers actually care anymore. I see all kinds of vehicles with huge C pillars - like that Camry you rented - and a lot of them have dented bumpers like they backed into something they couldn't see.
Car companies don't fix the designs, though. They just add more features like BLIS and proximity sensors that beep at you when you're too close to something. This helps, sure, but it also reinforces the idea that drivers don't need to actually look around them.
With our aging population, we'll have even more people who can't physically turn to see what's around them. And because these folks also have trouble getting into and out of cars of normal height, they buy CUVs which have even worse visibility.