1) You should never stop working. Humans need purpose. It may be worthwhile to think of it instead as saving money so you can transition to a more meaningful job. Maybe one that doesn't pay anything at all, like child rearing, or volunteering.
This conclusion implies that if you CAN already do something meaningful, it's probably better to do it sooner rather than later because youth/time is more valuable than money.
2) The 4% withdrawal rate works in a world where the US is dominant and young. Economic growth is fueled by young workers. We are able to stay relatively young thanks to immigration, but birth rates are falling all around the world.
Also, the geopolitical world is changing. The most likely scenario is that US power continues for the next several decades. A less likely scenario is a painful major conflict with China/Russia/etc. in which the US wins. An even less likely scenario is a painful conflict that the US loses. In the second two scenarios, you can't rely on the 4% rule to hold.
3) I like the idea of financial independence. But financial independence in that you have a chunk of wealth to cushion blows or go on sabbaticals, not that you're done having to work forever.