Because you need effort + the ability to create value, not one or the other. Some people have one but not the other and seek out help to bridge the gap.
Yes, also effort is something a person can influence directly, while ability cannot or only indirectly (education ...) so it makes sense to focus on things people can influence, but but achievement is the ultimate target.
Yes, also effort is something a person can influence directly, while ability cannot or only indirectly (education ...) so it makes sense to focus on things people can influence, but but achievement is the ultimate target.