Although lots of people love certain parts of FL (Jupiter, Boca, Lauderdale, Sarasota etc.), the people we’ve known who have retired to Florida and other less expensive cities, did it primarily because they could no longer afford California.
You’d be surprised how many people who are flush with funds in CA, or other expensive locales during their working years, can’t afford to live in those locations later in life. Many articles, such as the one you read, seem to be targeting retirees who want to maximize their retirement dollars.
I think everyone should retire whereever they want to retire, but we’ve lived in or spent extended periods of time in many places all over the world, and we plan to stay in San Diego for the balance of our lives–retired or not.