Once companies reach a certain size, their continued success is driven far more by network effects, brand awareness, anti-competitive moats, and similar factors

Once companies reach a certain size, their continued success is driven far more by network effects, brand awareness, anti-competitive moats, and similar factors than they it is by efficiency and innovation. There are plenty of individual examples in both directions. Instead of SpaceX, compare private insurance companies to medicaire. Medicaire is far more efficient.