Over the years I have come to realize that there are many many areas of aptitude. Some people are good at almost all areas, some are great at some, and poor at others. And there are some who in certain areas are a zero.
I have a sister who has 2 degrees in business, and is a very will organized person when it comes to anything dealing with taking care of money, paper work, or business. But in the area of mechanical aptitude she is a zero. Over the years I have been amazed at how she has messed something up because she did not have a clue as to what was going on mechanically, or electrically. That does not mean she is a bad person. In fact she is a very good person. It is just that she does not have any mechanical reasoning at all. My quick and dirty and somewhat insulting, and some may say incorrect, way of thinking of her mechanical aptitude so I never forget how bad she is at that area of reasoning, is that she has the mechanical aptitude of a doorknob. A real absolute zero, but only in that area of thinking. When it comes to dealing with her, you just have to never rely on her to do anything requiring any knowledge about how something works or should be taken care of. That is just the way she is. Realizing that and never getting her involved in doing anything requiring even the smallest amount of mechanical reasoning is a good way of avoiding problems that she will create in ways that amaze you about how anyone could be so clueless about what is going on.
Again the point is, there are many areas of aptitude. And it happens that there are some people who, in certain areas score almost unbelievably low, while in other areas of aptitude they may be fully functional, or even above average. That is just the way they are.