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Did you imagine that every Tornado in Gulf 1 would come back?
That every tank in WW2 would survive?
Do you think that it would be sensible to train every soldier to SF standards?
There come a point where the cost of making the perfect warship/aircraft/soldier means you can only buy one (F22?), and it may be better to have lots of imperfect.
There is both a law of diminishing returns and an arms race going on, and in 1982 the Exocet was difficult to counter.