Like here's a random listing from 30 seconds of searching that has light renovations: https://www.redfin.com/WA/Seattle/10201-23rd-Ct-SW-98146/hom... and if you spend enough time looking for "affordable" options in suburbs, it's not hard to find ones that have not been renovated since they were built in the '70s and '80s.
Tons of houses in the 70s and 80s in Vancouver was built in the exact same style because of zoning laws and certain regulations at the time. I couldn't tell you why they chose stucco but they basically all follow the same template and they're basically a signature of the city now.
So clearly the design was common throughout the rest of BC, even up north too!