I think realistic management of expectations is important, the world simply doesn't work in the way you suggest it does though I agree it would be preferable if it did.
I think that Pkoed's advice is unrealistic if everyone attempted to apply it to their lives, but this of course is never going to happen. On an individual scale, for the few hundred people who read his point of view here, it strikes me as a valid and reasonable way of seeing the world.
I think realistic management of expectations is important, the world simply doesn't work in the way you suggest it does though I agree it would be preferable if it did.