The problem is that they're still largely perceived as being the best ever. The American founding fathers are pretty much deified, and it's still expected that important policy decisions will be made based on what these centuries-dead aristocrats thought rather than based on what's needed in the here and now. Other countries don't do this. I've never in my life heard a politician try to attack or defend a position based on what John A. Macdonald would have thought of it, but in the USA that sort of thing happens all the time.