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Tire width is more or less proportional to the weight of the vehicle and the design tire psi.
The old-time cars with skinny tires didn't weigh much.
That, and over time understanding of tire dynamics has improved.
Semi tires aren't 20" wide because they don't spec 30 psi.
Prius would not have 2" wide tires unless they spec'd em with way higher psi than they figure the consumer will accept.
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