lakshya14MBA admission office at most universities review applications using wholistic view rather than checklist view.
MBA schools do prefer folks non-traditional backgrounds as that brings thought diversity to the class and adds to the overall experience. But it is more than just saying that a person who has a non-traditional degree/experience will make the cut irrespective of other considerations.
They too, like all other candidates, need to talk about how their current non-traditional background will help them during and post MBA. What transferable skills they will leveraging during MBA, how will they add value to their class, and why do they need MBA in first place?
Generally, people from non-traditional background with decent GMAT score might go through the first cut but they still need to answer all of the above.
I am from non-traditional background, I still had to have high GMAT and great cover letter and exceptional interview before I got the acceptance letter.
What this means for traditional backgrounds is that yes, they need to stand out. May be have an exceptional volunteering experience or talk about a passion you pursued or get multiple promotions/CEO's award etc in addition to a good/high GMAT score.
I know people from traditional backgrounds with decent GMAT scores who were in good b-schools because of the extra-mile they went in other aspects of their applications.