It's just not viable if you have a mortgage and insurance. There's also FinCEN reporting though temporarily suspended. I get the feeling you dont have any experience dealing with these bureaucracies. Otherwise you wouldn't be so flippant.
If your answer is dual citizenship giving them access to banks abroad, a wealthy American can buy another citizenship.
There is nothing to stop them from just not owning a mortgage or house, since that is the thing you say will catch them.