This is certainly true - we are all carrying various mutations that influence who we are. For example, I am now sitting in front of my computer drinking a chocolate milk - something I can only do as an adult because I have a mutated version of the lactase gene that causes lactase to be expressed in adulthood (lactase persistent syndrome). Until agriculture was invented this "syndrome" had negative value since unless I am drinking milk it is a waste of resources for my body to make an enzyme that won't be used.

As we learn more about each persons genome I hope we stop categorising people into people with a "syndrome" and those without.