If you had just invested all your earnings into Bitcoin since 2010, you'd be a billionaire. Why does everyone think that retrospective advice is useful? Are the

If you had just invested all your earnings into Bitcoin since 2010, you'd be a billionaire. Why does everyone think that retrospective advice is useful? Are there universes where the S&P500 tanked while real estate market held its value? Of course, and for varying decades this is true. But to say that no one should ever invest in anything except S&P is to argue that nothing ever new should ever be created.