[yladiz]

Without getting into the differences about the benefits you get in many European countries compared to the US, I think it's pretty naive to think you could realistically save enough from a salary alone to live for an extended period of time (something like 1-2+ years) in the US simply because the net salary is higher. Expenses are high, and when you become unemployed they become higher (e.g. you have to pay out of pocket for your health insurance, either from the ACA exchanges or from COBRA), and if you end up having an unexpected expense it could cause a lot of issues since you don't have a regular stream of money coming in. If you're lucky it could be okay, but it's luck dependent.

Besides that, if we assume AI will take many jobs in the coming years, what are you to do if you suddenly become unemployable with your current skill set and need to, for example, go back to school, or find an entry level job in another field with a potentially significantly lower salary? Live off of your savings?