How about just being reasonably rigorous in your assessment instead of being overly cautious or overly idealistic? This division into can-do and can't-do seems

How about just being reasonably rigorous in your assessment instead of being overly cautious or overly idealistic? This division into can-do and can't-do seems to represent two opposite extremes that might not reflect the majority. What's the real data here? From a practical standpoint, isn't it just risk vs reward? Can-do's probably get a bigger reward than can't do's, but they fail more. A can't-do gets smaller reward, but succeeds more.