I can look at a statistically insignificant sample.
My mom’s parents were comfortably upper middle class and never owned a home. They were long term renters in the midwest (Chicago area, Detroit area) then San Diego. They almost bought their apartment in Pacific Beach when it was being condo-converted in the 80’s – but were offered the option to continue renting. They had as much housing stability as home owners. Rented each place more than 10 years. One place for 20 years.
I don’t know if it’s a regional thing – but when I lived in Philly, there were a lot of middle to upper middle class families that were long term renters.