Logically speaking, this attitude happens to create the best odds for having a strong performance. Remember, if you're having fun doing something, chances are you're doing it well. So the more in-tune with your sport that you are, the better you'll perform. I can have a blast playing basketball and be performing my best. But if I'm competing against a professional ball player, I'll still probably lose.
Goals are great for tracking and encouraging production when training.
But if these goals become an obsession, than emotions will wreak havoc on the psyche. Riding that roller coaster never makes for consistently great gameday performances. To counter act this effect, revert back to the why's of lifting.