A car is needed in the U.S. almost everywhere.
In most of the country, without a car, you're basically dead.
Sure cities like Chicago, New York, and San Francisco, if you want to pay thousands per month for a tiny space.
The lack of good public transportation is one of the main reasons I wouldn't choose to live in the U.S. Yeah you can Uber everywhere -- costing a fortune.
Thinking about these U.S. D list low budget options and comparing to outside of Thailand alternatives (where you generally don't need a car and taxis are cheap) makes the non U.S. choices look better overall.
The main advantages of the U.S. for oldies is Medicare, family friends contacts IF you still have them, and no need for a visa.
But consider a non US alternative like Queretaro Mexico which is not so cheap anymore.
Let's say a budget of 2000 dollars. Rent for a good place, mild weather all year, great restaurants you can afford to eat at daily, medical care affordable even paying cash, affordable taxis no need for a car. You could even do 1500. But 1000 because of rising rents and peso strength, not any longer. There are D list places in the US for similar budgets but do you get all that? Not even close.
Because of rising costs, its sometimes necessary to look at more D list places abroad too. Such as in Panama. Coronado and Boquette will be expensive but you can move to Chitre and meet low budgets. In Portugal, Braga or Coimbra instead of Lisbon or Porto, etc.