People struggling financially and being unable to buy property are policy choices that have nothing to do with reliability.
To illustrate: If we had never created the Social Security program, a lot more elderly people would be impoverished, but that wouldn't be unreliable, it would just be a different policy choice. But now that we do have the Social Security program, if people start being unable to get their payments, then that would be unreliable.
The distinction is: Are we keeping up our end of the bargains we've made? Historically, we have done so to an extremely high degree, which is why our credit is very good. And not just in financial terms. The current administration seems hell bent on ruining that long history of reliability, and that's very bad. But it's just not true that the US government has been unreliable historically.
What does that have to do with the fact that most citizens are struggling financially and fewer people than ever are able to buy property?