After doing some cursory research, FIU has the same academic profile in regards to students as FAU, USF and UCF. They admit on average 50% of their applicants and the GPA, SAT/ACT ranges are similar. FIU may have improved, but they are still in the same class as FAU, USF and UCF. It's obvious that you are trying to cheerlead for FIU. Yes, there are highly talented kids that choose to stay home and go to a school that is significantly worse than other schools they got into. Whether it's because they want to stay home, whether it's financial reasons, whether it's because the local school offers a major that isn't offered at other similar schools, it happens. That said, for the most part, it's rare. If you were to take 10 local kids that are elite academically and give them a choice between UMiami and FIU, odds are Miami is going to win that more than 50% of the time, and that's a lowball estimate.
By the way, the local kids aren't Miami's bread and butter, they are a significant part of the student body, but compared to a state school, a shockingly low part of the population. 24% of the student body in 2018 was from metropolitan Miami. That's a pretty small number, compared to a place like FIU, where that number is well over double, hence their reputation as a commuter school.
What‘s your email at the Hecht? I would rather email you then post a long message on here.