In reality based combatives / martial arts, ones goal is to quickly and effectively stop your attacker or attackers. We are not trying to score points, a submission or even a knockout. We are looking to incapacitate, we want to do as much damage as necessary as quickly and effectively as possible as to escape, stop the attack, or stop the attack long enough to escape to safety.
Optimally we are looking for economical efficiency in our techniques and approach to training. The best way to achieve this is to know and understand what the most effective targets are. Targets really fall into two categories, Primary and Secondary. Within Primary targets are a sub group that I refer to as "your soft targets".