[solstice]

You don't build several thousand F1 engines. Further more these engines do not need to be exactly the same, they just need to be good and follow the F1 framework. You don't hand build when you manufacture large series and replication is not a main goal of hand building. Another reason for hand building is cost of setting up a fully automated production. It make sense to hand build at low volumes of exotic units that can carry high cost. Automation is likely preferable of many reasons, consistency is one of them but if you build few engines the investment might not make sense.

If you think hand built engines of a larger volume is more identical to each other than robot production, think again.