Not all goals are created equal. Some are more difficult others less so. Many would still struggle.

But they'd struggle at achieving harder versus easier goals. I don't think Swimmer is suggesting all goals would be equally-easy to attain (we should rightly be suspicious if someone thinks that in a fair, self-actualized world, becoming an astronaut and becoming a teacher involved the same amount of effort), just that given two people trying to achieve the same goal (say, stability of person and health and shelter and income) by the same means, we would expect to see "luck" and the difficulty of the task determine probability of success.