MMM did barista FIRE, albeit as a blogger and carpenter.
He also only counts daily expenses when he shares his budget. Travel, an addition to the house, a car to prove to his followers that they can get a car...all business expenses.
However, there are plenty of places where $600k ($24k pa) is doable. Just be sure to have that sinking fund available for home repairs and other non regular expenses. We plan to live that lifestyle occasionally, but aren't willing to commit to it for the next 60 years, so we continue to work now while the salary is ridiculously high.