90% of the population lives within 100km of the US border.

Unless it's a life-or-death emergency (where the ED has guidelines to see you right away anyway), every Canadian has the option of paying for any level of service they want, even otherwise covered services.

Then there are the firms that walk the line and charge you as "preventative health" services.

Not every Canadian is admissible to the USA, and as a sovereign nation our policy should stand on its own.

Most are, and for those that aren’t, most other Western countries can't check Canadian police records and readily admit Canadian citizens.

And of course that assumes one can afford the treatment, which for non-covered treatments can be hundreds of thousands of dollars.

of course you can, there’s this thing called plane and you jump on in and go to wherever the treatment you want is performed, pay up and get it. There’s absolutely no laws preventing you from getting payed care in the USA or anywhere.