1) To stop working when you hit a certain number seems to me to be falling into the faulty logic illustrated in Freakonomics -- when a taxi driver works every day towards a certain $ figure, he suffers on crappy days (keeps on driving to little benefit) when fares are just not coming, and cuts off his earnings on great days where business is pouring in like crazy. Instead, you should call it day early when the business sucks, and ride it when times are good.
If you're good at what you do, aren't physically being exhausted by your work, and pulling in good money, why wouldn't you keep on working and make the most of your time + skills? Did you go through all your education and training just to hit a certain number and call it quits?
2) In some ways I don't get the "financially independent" life. Sure, you're no longer absolutely needing to have a job. But what do you do with the rest of your life? You're just retired at 50? With what to challenge / strive for?
Maybe I'm just fortunate in that I don't mind working / find some fulfillment from it, and don't have a burning desire to sit around with no activities for 5 days a week. Maybe if I were smarter about it, I could be some kind of board member or something? Is that what people do? What takes the place of work?