Is there any reason to think that your advice is correct? Any kind of study showing a correlation between "a vision driving someone to the core" and success? T

Is there any reason to think that your advice is correct? Any kind of study showing a correlation between "a vision driving someone to the core" and success? That idea, while a very good soundbite, flies in the face of the evidence - almost all startups shift their idea, sometimes quite a bit, before becoming successful.