Efficiency sounds so nice, but ever since working on a safety based project and observing

1) Efficiency hates redundancy

2) Redundancy is, like, the easiest, most zero-thought way of adding robustness

I've been a little suspicious of efficiency.

And we see questionable efficiency optimizations all over -- here in an individual business, in the greater economy (Let's over-specialize our economies, it is more efficient. Let's JIT manufacture everything, buffers cost warehouse space).

Just add redundancy. It'll be twice as expensive but it won't explode if something goes wrong.