Sure, yeah. My point is mainly that expenses for early retirement in the US have the potential to vary a lot compared to... well, basically any other OECD state

Sure, yeah. My point is mainly that expenses for early retirement in the US have the potential to vary a lot compared to... well, basically any other OECD state, really, mostly due to healthcare. This makes the lower bound for a reasonably-safe early retirement quite a bit higher, such that merely generating enough safe-withdrawal income to live on in a good year isn't enough, even if the markets do exactly as well as you're counting on and that income's steady.