We don't need new housing. Again, ten percent of the housing is already standing empty because people who want to live there can't afford it. As a result a large chunk of people who work in Seattle don't live there, but in outliers like Kirland and Bellevue. Those in the working class who do live there struggle mightily because the jobs don't adequately cover expenses. And workforces don't care how quickly they burn through employees, because people seeking jobs is high. So they run these scummy workplaces which are horrid to work in, and then tell the workforce that if they don't like it, they are easily replaceable. And if they ever have any financial fluctuation, they axe a bunch of employees while the higher ups have no consequence, reap insurance benefits, and then start the chain over again. So right now it's really *not* in their best interest to support a sustainable workforce.
Seattle would have been better off if the tech giants never arrived.