The top sign of this is someone asking which MBA is best. For example: is Melbourne better than Edinburgh? Without context it is a meaningless question, like saying what is better: a $10,000 engagement ring or a $10,000 motorbike?
Not having a specific goal makes it harder for you to target the right schools, and it makes it harder to be admitted. For example, someone who applies to both Melbourne and Edinburgh probably cannot work in both countries, probable doesn't understand the different employer pools of the schools, cannot see how the graduates of those programmes have different outcomes. If you understand the schools that are most able to meet your specific goals, then you can convince the schools that their school is a better fit with your goals and their potential employers. As a result, you are more likely to be offered a place. Between two similar candidates, schools will always prefer the one who is most likely to accept the offerand is more likely to be valued by their partner firms.
There are some great articles on this. I will flag up the Economist https://gmat.economist.com/gmat-advice/business-school-admissions/application-advice/how-craft-effective-career-goal-essay-your-mba-application
Many business schools have great articles too: http://bit.ly/SetPostMBAgoals