The typical FIRE requires compounding growth. You start with portfolio worth 25 years of expenses but if expenses keep on growing due to inflation and portfolio shrinks because of expenses and zero growth, it can get hairy quite fast.

There are various ways to look at numbers but my thumb rule is 4% inflation 9% growth keeps you perennially happy with some choppy years of course. 4% inflation 9% growth implies you can withdraw 4-5% every year and still have equivalent portfolio in inflated money.

Typical FIRE also requires access to affordable healthcare. In the US that is going away with ACA subsidies.

Five years ago I paid for “market rate“ insurance through my business for my family because we did not qualify for ACA subsidies. The cost was about $40,000 per year.