One thing that never seems to be modeled is variance or risk of repair. F.ex. adding something like this: https://news.ycombinator.com/item?id=11879869 https:/

One thing that never seems to be modeled is variance or risk of repair. F.ex. adding something like this: https://news.ycombinator.com/item?id=11879869 https://news.ycombinator.com/item?id=11879869 Buying a super complicated engine with high reliability is a different risk than buying a simpler engine that has lower reliability, but that can be repaired much more cheaply.