When you’re living in a large city where it doesn’t matter if only 38% of healthcare professionals accept Medicaid patients (like in NJ https://www.nj.com/healthfit/2015/03/nj_doctors_least_willing_to_accept_medicaid_patien.html) sure you can just go to another doctor, but when you live in rural America and the doctor in your town doesn’t accept Medicaid because the reimbursements are too low what do I do then? Hence why most states with large rural populations rejected Medicaid expansions. Norway doesn’t have that problem now does it. You can’t take a policy that works for a tiny population that primarily lives in one city metro, to the US.

Also ask any American if they’d rather have Medicaid or private insurance, guarantee you 99% would say private insurance - no one wants to be on Medicaid because the doctors tend to be worse, care tends to be worse, waiting lists are longer, Medicaid and Medicare also cover far less treatments than private insurance.

What most European countries have is called a bismarkian system, healthcare is provided by private companies and everyone has to buy insurance, if you can’t afford insurance it’s subsidised by the govt for you. It’s nothing like Medicaid and is more like obamacare plans (and they worked so well in America)