I don't think that's true at all. My experience (which appears to be the same level of 'fact' as you present) is that there are people who lease, who trade out cars every X years like clockwork, and people who buy who keep the car until something happens that clicks 'that isn't worth fixing', which these days is often way down the road. Possible not 200k miles, but far more than 3-4 years.

FWIW, other than one car I bought new, every car I've had I purchased off-lease (so lowish miles and 2-3 years old) and kept it for at least 7-10 years, often getting to 200k miles.