You aren’t exactly going to find an SFH in the suburbs that is much cheaper. So you have a point, but you have to choose between an SFH, a similar priced townhome (basically an SFH without a yard), or a condo with an HOA, all basically unaffordable unless you want to commute from Kent or Marysville. Seattle still has density (the townhome I live in in Ballard is one of three that used to be one SFH).