There are NO CHOICES with Obamacare.
Of course there are, that's the problem the people in the OP are having.
If I'm single person looking for a plan on Washington's exchange (the WA Healthplanfinder), I can choose a plan that doesn't have Seattle Children's in-network. That's a specialty hospital that likely commands pretty high reimbursements and if I don't want a plan that's making payouts to them I can buy one. That doesn't mean there won't be pediatric specialists in the plan I choose (there will), it means that particular facility won't be in-network.
Similarly, if I'm shopping for a plan and I
do want Seattle Children's in-network because I have a child (particularly one with a rare condition), then I would choose one of the exchange plans that retains them in its network (in the WA Healthplanfinder, that's any plan sold by Group Health, Community Health Plan of Washington aka Community HealthEssentials, or Molina Healthcare of Washington).
Apparently the people in the OP weren't savvy enough shoppers to select the plan that best met their needs and preferences. Maybe, like you, they were misinformed into thinking every plan is the same thing, there aren't any choices, and shoppers don't have any opportunities or responsibilities to examine their options and make an informed choice. Shopping really isn't that hard.