Remember that olympic lifts are ballistic movements which require power. Pure strength is more characterised in the ability move a heavy weight (as in olympic lifting), but through a much slower grinding movement (powerlifting, strongman, etc).
And with regards to chains, they work with pure strength because the movements are controlled and the chains add weight as the come of the ground in a steady, uniform manner. This would not happen if the bar were to be violently pulled. This sounds like a stupid recipe for chain whipping yourself!