this was a good read, its definitely a weird societal position.
Most people's spending catches up, or at least increases, with their wealth. Completely ignoring the whole keeping up with peers aspect (who are also wealthy now) and even power/wealth craving, most people aren't content just realistically living within the perpetual means provided to them by their accumulated wealth. Additionally, a lot of people that think they'd be content not working and living a simpler life, actually aren't when they give it a try.
I'm extremely biased, but I always end up citing hobbies as the problem and solution in this kind of situation. Ask a friend what they'd do if they didn't have to "work" any more. Most of them are going to tell you that they have no clue and haven't thought about it, or tell you about something that isn't actually feasible to be your primary activity without a steady traditional income stream.
I'm mostly talking about people that barely qualify for this discussion in the 1-5m wealth range. As mentioned in the article, this is generally plenty to satisfy general FIRE requirements, and even tradition retirement requirements. But most people in that wealth range would also have to change their lifestyle to safely make retirement happen, and that's a tough sell when most people get their dopamine fix and sense of enjoyment/relaxation from expensive vacations, fancy dinners, new cars, new gadgets, stuff directly tied to spending money with no return.