I know way too many riders who never practice, can barely pull a U-turn from a stop, don't know how to use their front brake effectively, and vastly overestimate their abilities. And then if a car even dares to accidentally not see them because they sat in their blind spot they flip a shit. I know riders who are very good, but unfortunately in the place I live I know many many more who are just not very good and ride very unaware of everything around them. And unlike driving a car, there is a different skill floor/ceiling to be considered competent.