Out of pocket does not include premium. One auto accident or heart attack could wipe you out if there is no cap. My wife has run up about $300,000 this year with no emergencies. My out of pocket has been $0 (first year Medicare supplement coverage is a real good idea).
I'm aware of that, I was just pointing out how absurdly high a max out of pocket of $12,700 is. It's like not having insurance, in my case, based on my family's history and am also aware that could change with one major illness or injury.
I have medicare, my wife and minor children do not. My former employer is my supplementary provider and their primary provider.