Planting a stake in the ground will make it harder to move to chase after better opportunities elsewhere, and that opportunity cost probably outweighs any asset appreciation you would see.
Buying a primary residence should be treated as an opportunity cost for the invested money, as well as a necessity for the shelter. If you are coupled it's harder to coordinate big moves so that makes owning more attractive, and if you have children you also want a stable environment for them to grow up in. But all told there are far better investments than a primary residence.
Seattle also has a high price-to-rent ratio: https://www.mashvisor.com/blog/best-real-estate-markets-pric... You may actually lose money on a cash flow basis if you buy.