It is funny how differently everyone looks at a commuter bike. I opt for simplicity and ease of maintenance and less stuff to haul, but that is just for me. Not everyone will want a bike that cannot carry a rack or even a water bottle, let alone full fenders. It also depends on location. OP is in Florida, so mostly warm weather riding. I would want to ride something light and fast, maybe a clip on fender if needed for wet weather. He/she will not be dealing with snow/slush/ice etc.

I completely disagree that the coaster brake single speed bike is a bad idea for a commuter on flat land like Florida where the OP is. Single speed is a blast and you do have the right gearing, you just have to adjust your riding style if there are hills.