How often do people actually change their registration/affiliation? I imagine to most voters they just stick with whatever they had when they first registered but are of course free to vote for whomever they like. You’d have to be really ticked off at your party and/or want to have a say in the primaries to change your registration. Or maybe it’s very easy to do in FL? I dunno.
Frankly, in this environment, to minimize the chance of my mail-in ballot getting shredded, I'd go No Party/Unaffiliated.
It is fairly easy to change in FL but most don’t bother.