I don't see expendability necessarily as a downside - if the system would support lifetime learning of experts. Building and rebuilding the same thing again and

I don't see expendability necessarily as a downside - if the system would support lifetime learning of experts. Building and rebuilding the same thing again and again should be a good way to learn how to make it as good as it can be from design and construction point of view. The problem is if the system does not cherish and support this opportunity to learning and mastery - which many for-profit commercial establishments sadly don't.