I had to quit reading any FIRE (financial independence, early retirement) blogs because they were full of people headed down this same path: Extreme frugality, bare minimum savings, assuming their lifestyle would never change and nothing would ever go wrong. Retiring at 30 sounds great, but no one's life goes exactly to plan for next the 30-40 years until traditional retirement age. People change, expectations evolve…
The author is a literal millionaire living (when not working in a well-paid job) on what is roughly the median income for their state. This is neither extremely frugal nor bare minimum savings.
They downgraded from "upper-class lifestyle with upper-class work" to "middle-class lifestyle without work". Not exactly going poor.
> assuming their lifestyle would never change and nothing would ever go wrong.
They bet that nothing would go several-hundreds-of-thousands-dollars wrong. Sounds like a fairly safe bet. If it's likely that you'll get into a situation that costs you that much, having a job doesn't guarantee much either.