I live in Seattle now, am married, and have an infant. I find Seattle not friendly towards families at all. The going rate for a daycare here is 3.5k per month for an infant. My wife and I are both ~7%ers? individually and we can barely afford our home (a tall skinny townhouse with no yard) and the cost of 1 baby. Having a family is hard here... Also, I don't find Seattle safe for infants and toddlers, or anybody really..
What big tech wants are people who are willing to give up everything for the dream of making money, and that's what they got.
Edit: Our life is pretty good in any case. I would never let my kid go outside and play unsupervised in Seattle even tho I myself did this as a kid in my home town (the safety I was mentioning).