Different spectrums, indeed. I only meant to clarify that aircraft redundant systems exist because failure mode consequences would be catastrophic with unaccep

Different spectrums, indeed. I only meant to clarify that aircraft redundant systems exist because failure mode consequences would be catastrophic with unacceptably high probability otherwise; not simply because things in general fail all the time, as was asserted. It's a subtle yet significant difference that other readers in passing may not recognize.