I don't think there is anything really wrong with FIRE itself. What I do think is that many people working towards FIRE don't know how to be happy and think that work is the only thing between them and happiness.
The other problem is that extremely frugal people are going to have a harder time making and maintaining friendships, because people bond over activities that cost money. I would argue that being able to quickly and systematically create deep, high-quality relationships is as important if not more important to FIRE than actually having the money.
The other problem is that extremely frugal people are going to have a harder time making and maintaining friendships, because people bond over activities that cost money. I would argue that being able to quickly and systematically create deep, high-quality relationships is as important if not more important to FIRE than actually having the money.