Florida's argument for not using the NREMT-P is its test score is the equivalent of 70% while Florida wants 80% on their state exam for a passing score.
However, it is amazing that even with all the advantages of knowing what is on the practicals and the not too high standard for passing the NREMT written, some continue to complain the test is too hard. Happily, those that say this usually do not pass the Florida exam which is pitifully easy also if you memorize the right stuff.