Maybe true for pure software projects. There are other things in tech - robots, from drones and cars to rockets, for example. There are complicated systems that will never, even with banger LLMs, be designed and executed by a small team. Some teams are lightweight and agile and manage to work magic. Maybe tools will help a little there… not so sure. Systems of systems has boggled planners since the first Apollo program, at least. It’s roughly the same approach today.