I see that Manatee county has ordered evacuations and Hillsborough County has for some zones. Where to two million folks go when the whole state is a target? There is another million in Pinellas County. Glad to see that Cozumel is still not in the cone.
They aren't evacuating those entire counties (as you mentioned just some zones). Just Zone A the last I saw.
There will be inland shelters opened for those that want to go there. Many people with go stay with family or friends that live a bit inland.
Florida orders evacuations primarily due to storm surge. They don't order evacuations for wind or rain.