>If you're replacing cars every 3 years like an average westerner, given the age of cars I see on the road, you are doing extreme harm.

Do you have any sources for this claim? I think I only know of a single person who changes cars in 3 years due to leases and only did it once.

According to the US government the average age is 11, almost 12 years.[1]

[1]https://www.bts.gov/content/average-age-automobiles-and-truc...