As a child, I often found myself watching re-runs of old Looney Toons episodes and was always amazed at how Wile E. Coyote could be so committed and enthusiastic in his pursuit of the Road Runner, yet somehow be so inept at actually catching him.
Despite the extensive planning and scheming he would do, a small mistake would always derail the plan before he could catch the Road Runner.
As an adult, I now realize that some of us struggle with certain aspects of our jobs. It's not always an indictment on our effort or enthusiasm. We just aren't good at certain things.