You do have the option of going back to work if shit hits the fan. Maybe it'll be harder to find a job, or to find one that pays as well as before, but that's pretty heavily tempered by the fat nest egg you have. It's a pretty big misconception that by "retiring" you're permanently cutting off all abilities to produce income ever again.

It's easy to see "oh if a wealth tax is introduced, you'll run out of money by 50" as if it's a huge hole in the plan, but if you're 30 that gives you 20 years of draw down time. A change in the market or legislation won't sneak up on you and suddenly drain you of all your cash - if it does, it's probably something affecting the entire population. You'll likely have a year or two of drawing down more cash than you should before you pivot your plans.

The most vulnerable time during FIRE is the first few years of early retirement (where a market crash could wreck you), but is simultaneously the point where you're still at your most employable (plenty of relevant contacts, skills that aren't out of date, and a relatively small gap on your resume).