It has to do with side discussions or assumptions commonly found in other threads about how it is desirable or undesirable to be among the top students* in your college, or whether a college with more or less diversity in academic capability* among the students is better. For example, those who prefer advocate that strong students attend elite colleges apparently prefer not to be among the top students in college, and prefer that college has less diversity in academic capability. On the other hand, some suggest that pre-meds choose a college where they are among the top students*, in order to have a better chance at competing for A grades in college.
*Based on previous academic credentials.