In general targets are to push us forward. Have you ever thought what if your aim is limiting you? Because whenever you are chasing any aim, it requires your time and efforts. You might end up having something which is way below your capabilities, if you continuosly chasing without validating.
When we had decided our goals our thought process and capabilities would be different than today. Ideally, we should periodically validate our goals so that at least they don’t limit us.