The '96 Miami Shootout was a collision of tactics.
The FBI used the tactic that had always worked for them before, run the car off the road in a "felony car stop", run up with pistols and take the bad guy into custody. All the cars had "bullet proof" vests and shotguns, but few were used. It was hot that day and none of the agents, on what they thought was a simple surveilance, were not wearing them (for comfort). They were all experienced agents with the best gear they were allowed at the time.
Platt and Maddox were both former Army airborne MP's. Platt had no problem shooting people, it could be said he liked it. Platt and Maddox bailed out shooting (admittedly Platt more than Maddox), quickly gained fire superiority, and never surrendered it. I think the FBI report at the time said Platt fired a minimum of 140 rounds.
When the shooting started, a lot of things went wrong for the FBI, some agents lost their weapons (revolvers), only one (or maybe two) agents had the time to secure their armor, Ben Grogan, the best shot they had, lost his glasses and was effectively blind, the heavy guns, the M-16's were absent from the scene - those agents were too far away to get to the shootout. Platt bailed out of the car firing, using his training to good effect, firing accurately and firing to keep the agents heads down as he, and Maddox, moved.
The question of what if the agents had "X", while a lot of fun, is somewhat acedemic. I would love to say that if everybody had a .45, things would be different. But Dove and Reisner ran their S&W 9mm's (14 shots +1) empty at least once in the shootout, with a .45 (7 or 8 +1) that just amounts to about twice as many mag changes, and the "allowed" load for most LEO's is two mags. Basically, I think the agents would have run their .45's dry. Mirales finished both bad guys with a .357 loaded with +P .38's (with considerable help from a 12-gauge 870),so horray for old-tech.
To sum up, I think the Dade county coroner had it best when he said of the incident (paraphrasing) 'the motivated individuals with rifles, siezing the advantage, will almost always prevail".
Or, as Cooper said it. "A handgun is a great weapon to use to fight your way to a rifle."
Off my soap box now. God bless our fallen heroes, Ben Grogan and Jerry Dove. And, folks, lets go easy on Mas Ayoob, please?