I've always been amazed at how analogous the human body is to a computer system.

"Junk DNA" resembles an infrequently running cron job, or some edge case handling of a tricky algorithm. It may be rarely "activated", but it came into existence for a reason, and you should be wary of just deleting it just because it doesn't seem important at the moment.

But you make a great point that perhaps this DNA could also be a set of amazing programs or libraries our body has never run. What if we just need to find the right way to kick them off? Perhaps geniuses are simply people who have found a way to tap into these programs? For example, a musical savant or a person who can withstand extreme cold. Could traits like a great sense of humor even boil down to tapped/untapped DNA?