United does not have a hub in Fort Lauderdale.
It is in the process of building one after Spirit's bankruptcy and increasing regional demand. United is starting a direct flight from Los Angeles to FLL and is planning on using FLL as a base for flights to Africa and increased service to the Caribbean. Also, if United can push for a people mover to connect the airport to the nearby Brightline station, that would open up the entire Central and Southern Florida region via one United hub.
I agree with everything else you said.