Final answer:
Knowing how above or below average you are at everything would provide a comprehensive understanding of your overall performance across various domains, while knowing how above or below average people are at one skill/talent just by looking at them can be useful in specific contexts.
Step-by-step explanation:
Knowing how above or below average you are at everything would provide a comprehensive understanding of your overall performance across various domains. This knowledge can help you identify areas of strength and weakness and make informed decisions about where to focus your efforts for improvement. On the other hand, knowing how above or below average people are at one skill/talent just by looking at them can be useful in specific contexts, such as when selecting teammates or collaborators for a particular task. Ultimately, the choice between the two options depends on personal preferences and individual goals.