I think that some of that is fuel efficiency requirements forcing convergence.
The sedan thing weirded me out too -- I mean, when I think of a "car", I think of a sedan -- but as I understand from reading, that related to people wanting larger maximum cargo space in the car, like if they had to shove a piece of furniture or something in it. I'm in the sedan camp -- in the very rare case that I need to move something really large, I'm just gonna U-Haul it. But I can at least understand the concern people have.
The truck and generally-large vehicle thing, I think, related to a combination of:
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The chicken tax. American auto manufacturers have a 25% protective tariff covering the "light truck" class, making it much more profitable for domestic sales.
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Fuel efficiency exemptions granted that class (which I suspect may have something to do with regulations resulting from lobbying from said manufacturers and them having incentives surrounding the above chicken tax).
https://en.wikipedia.org/wiki/Corporate_average_fuel_economy
CAFE standards signaled the end of the traditional long station wagon, but Chrysler CEO Lee Iacocca developed the idea of marketing the minivan as a station wagon alternative, while certifying it in the separate truck category to allow compliance with less-strict CAFE standards. Eventually, this same idea led to the promotion of the SUV.[106][107]
The definitions for cars and trucks are not the same for fuel economy and emission standards. For example, a Chrysler PT Cruiser was defined as a car for emissions purposes and a truck for fuel economy purposes.[2] Under then light truck fuel economy rules, the PT Cruiser had have a lower fuel economy target (28.05 mpg beginning in 2011) than it would if it were classified as a passenger car.
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High American towing requirements. That is, American vehicles have far more restrictive towing requirements than in most other countries -- you need a larger vehicle to legally tow a given load than in many other countries. I suspect that the regulations may also have something to do with American automakers lobbying for protective regulation; it pushes American consumers to buy from that protected class of vehicles.
Long story short -- I think that you can probably chalk a lot of that up to rent-seeking out of Detroit.
The length I figure mostly isn't an issue aside from maybe street parking. But the width thing seems like a hassle.
I drive a (by American standards) narrow sedan, but I have to say that I keep seeing people have trouble getting out of their cars in older parking lots because there isn't enough clearance between two wide vehicles. Lot of people just lapping over two slots or avoiding parking next to another car.
I suppose that some of that is self-solving -- I mean, if there's enough inertia, parking lot operators will reallocate space in their lots. Or maybe vehicle manufacturers will step in and minivan-style sliding doors will just become the norm (like a two "sliding door coupe", maybe?)
I'd rather just have either (a) the protectionism go away, or (b) if that's not possible for political reasons, at least slash the misincentives associated with it. Just outright say "if it's an American-made vehicle, it gets a subsidy" if that's what industrial policy actually is. All of the associated regulatory stuff is creating inefficiencies of its own.