People love free parking. So rather than try to fight existing homeowners about the issue, I propose we give them what they want.
Seattle has a history of listening to neighbors before making any changes or allowing new buildings. We have a design review process for larger buildings, where the community is allowed to comment and a design review board can require changes to a proposed building in exchange for relaxing certain requirements. We have parking minimums, especially in residential areas. Politicians have scaled back the type of housing you can build, added strict requirements to micro-housing, stepped back from proposing corner stores, and have made many other changes under pressure from existing homeowners.
In fact, 65% of Seattle has been saved for single-family homes while you can only build multi-family housing (apartments, condos, even townhouses) on just 11% of our land. Why do existing homeowners resist any rule that allows more people to live here, as well as fight many projects that fully comply with the law? There are many reasons, but I propose the main one is parking.