While emergency care might only account for <10% of overall medical spending in the US, I would imagine its the leading cause of unexpected medical debt. Sure, over the course of my lifetime all my general practice visits, various medications, durable medical equipment, dental cleanings, eye exams, nursing home, hospice, etc. will probably total to >90% of my overall lifetime healthcare spend compared to the maybe 1 or 2 emergency room visits I'll have. All of that stuff
I'm already shopping around for when I determine if they're in-network our out of network. Seeing their list of silly prices does not really make a difference, as those silly prices aren't what I would be paying anyways. That's just their book prices, not the whatever member network special discount coupon haggle price shenanigans the insurance industry is doing.
The big troubling expenses are the emergency room visits where it turns out the guy who set your broken bone is now out of network and so you're billed some stupid price. Or as the above poster mentioned they were temporarily without coverage at that time and had an accident. In this case having the prices published ahead of time didn't really do you any good, as even the basic information of "is this doctor in-network or not" wasn't even able to be accurately looked up and compared.
And as for these stupid expensive list prices being published ahead of time making an impact to those without insurance, it probably doesn't change the math too much for the majority of those people. If they were unable to afford the crazy prices of insurance they're probably unable to pay the crazy non-insured list prices for non-emergency care, so they'll probably forgo it until their ailments get into emergency situations.
I'm still unsure how it actually helps. Can you fill me in on that?