Two failures?
"...It really doesn't double the cabling costs. Pulling a multi-pair cable is a sensible precaution..."
Ah, I see. We increase resilience by using a multi-pair cable but immediately reduce it by using... a multi-pair cable. When the digger goes through the cable it doesn't matter how many pairs are in it! (and yes, I know that in this case it wasn't a digger)
The only way to truly increase resilience is to have two cables which arrive by completely different routes - and that will increase the cost.
Biting the hand that feeds IT
