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You're simply ignoring the fact that there is significant engineering expertise in these designs.  It's just not in visible things like pseudo-LO shaping, it's in invisible things like producibility and system integration (especially links between aircraft and ground simulation and training).  And frankly, the lesson that we should be learning from the last several major aircraft procurements in the US should be that we need to do much better at producibility, if we ever hope to manage cost escalation.  "Bending the cost curve" sounds like jargon, but it's a real and important thing.