I believe that most people wants this F.I.R.E strategy so that they can retire early and enjoy the rest of their lives without working. If a person is working and can take care of their basic needs and have extras, that means that the above strategy will work for the person. Then he can apply all the rules to achieving the goals of early retirement and it all centers on living below your means, meaning that you should always budget your expenses below your income.
The problem that many people that are hit by inflation in their countries is that their incomes can barely take care of their basic needs, this the reality of many people. Many people are struggling to survive, even with a second job which is adding a lot of stress to them so it's not very easy for everybody to retire early even if it's their wish.