So what happened to all the huge cars in 2010?

There are probably several factors. I doubt there are as many people using a smartphone while driving in other countries. If someone wants to sit on their phone while commuting elsewhere, they can walk or take the train/bus/subway. In the US, you have to drive no matter what

Counterpoint, I wonder how much American culture makes people more willing to be in their phone while their vehicle is moving. The toxic work culture, the disregard for others, and so on likely contributes to a higher use of phone at dangerous times. Especially since larger cars are more about lethality.

What other developed countries have a 60+ hour work week in this day and age?

Edit: thought of a few in Asia but they all have public transportation so they can safely have their 1 hour "me time" commute. If Americans wanna play their mobile games to relax they have to do it in a car, oof.