I don't think it's unintuitive at all. 100% optimized means 100% without slack. No slack means any hitch at all will destroy you.
The flexibility necessary to succeed in a real world requires a certain level of inefficiency.
My point is that error correction codes have a precise mathematical definition and have been deeply studied. Maybe there is a general principle at work in the wider world, and it is amenable to a precise proof and analysis? (My guess is that mileage may be made by applying Information Theory, as used to analyse error correcting codes.)