There are a lot of different confounding factors when you set a trial date. As much as we’d like, Trump isn’t the only trial happening, so other cases have to come first.
There has also been a really big backlog on trials. Covid slowed EVERYTHING down. Here in Oregon it’s so backed up, there’s a class action lawsuit.
The Florida trial has extra issues. The number of top secret documents means having lawyers with top secret clearances, you also have two extra defendants who have to find their own Florida based lawyers.
All the added time is to make sure the defendant gets a fair trial.