Obviously reading comprehension is not your strong suit, so let me talk to you like you were 5.
That's you:
>hurr durr you're a mongol!!!
>America pays your treatment if you truly got cancer!!!!
Now tell me nigger, what if you don't have cancer yet? Cancer doesn't just pop up out of nowhere in a minute, it takes months, sometimes years to grow. To catch catch cancer early on, you need REGULAR CHECKUPS. Get it so far fuckface? To catch cancer early, you need regular checkups.
Now what if you can't afford regular checkups? What then? Does your shitty system cover regular americans, who need regular checkup, who don't have cancer yet? NO! Your shitty system doesn't. You have to be absolutely broke and on the verge of dying to get covered. I know this because I have a friend who is in that situation.
He couldn't afford healthcare, but since he was working, he was making too much to be eligible to the public system. Now he wasn't rich, he could barely afford to pay his rent, but apparently, the state set the bar so high that no one except people who are almost living on the streets could get into the program.
So he went years without being able to get health care he needed and he ended up getting so sick that he couldn't work anymore. Now, since he doesn't work anymore, he finally eligible to get on the amazing public healthcare system you mentioned. By that time, the cancer he had 6 years ago that was perfectly treatable, metastasized and the amazing healthcare that was provided by the state couldn't do shit to help him anymore because it was caught too late.
All this could of been avoided if he had access to healthcare. He didn't. So instead of having the state cover his 80$ blood test, which could of detected his disease in time and treat him easily with cheap drugs, they ended up killing him and spend over 500k+ on treatment that was ineffective.
Do you get why your system is shit yet? Your system kicks in right at the end, when it's too late.