Collier, Lee, and Charlotte are SWFL. Everybody who lives there calls it that. Nobody in Miami would accept Fort Myers being called South Florida. Anyone saying otherwise is probably not from either place. Yes I understand that "geographically speaking" Naples is further South than Palm Beach. But that's not how language works. What is geographically "Southeast Florida" (gross to even say it) developed first and became associated with the term "South Florida." SWFL developed later and distinctly, and thus gets a different name.

Why would you group Fort Myers with Miami? It makes absolutely no sense. Hardly anyone regularly commutes across the state. The Everglades divide up the two regions, thus they need two different names.

Also nobody would call the Keys "South Florida" they'd call them "The Keys".

South Florida is Dade, Broward, Palm Beach.