I would put the main point of Fight Club to be about how universal the feelings are, of loneliness and isolation in complex social/economic systems that they don’t actually control, despite the system continually relying on them for that control. The warning is that lonely men will crave agency, and might seek it out in destructive ways, even paradoxically turning over their agency to another, like a charismatic cult leader, if it means they can take part in another plan that they are no more actually in control of.