Have you ever felt a difference between the quality of your backside and front side snaps? Have you felt limited by the prevalence of right-handed waves, in your local spot, being a goofy-footer?
The majority of world surfers ride waves with their left foot forward. They're natural footers. So, what happens if they're challenged by an incredible left-handed break? Having the ability of riding it in switch stance mode would be perfect. Of course, the opposite situation applies to goofy footers.
The ability to surf switch foot may not be possible, in a matter of weeks. There are natural body characteristics that force your surf stance. Legs, knees, hips, feet, ankles may determine your dominant stance, but a lot comes from your brain.