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> The solution is so elegant it’s still being used today. The newest versions of the CH-53 of fiber optics to detect faults in the newest all-composite blades. The older variants? They’re still going with the nuclear option.

Huh? So it's not really in use today as much as hasn't been retrofit out. Those are very different. This also doesn't read well. Maybe rewritten without proofreading

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If it hasn't been retrofitted out, then it's still in use today. That sentence would only be incorrect if the new solution was retrofitted on all aircraft.

> is so elegant it’s still being used today

I think it's the "so elegant" part that's wrong. It's not still being used today because it's so elegant. It's still being used today because the old helicopters haven't replaced it.

I think elegance has to do with the technology of the time. Some clever design that is cheaper/better than you would otherwise think possible given the era. There are probably many elegant aspects to Roman aqueduct engineering, but they would still get replaced with modern materials during a retrofit.

if it was less elegant from a function/cost perspective, it would have been replaced a long time ago.

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