I think we are all in danger here of quoting SOME of the rules but missing the obvious rules of how the regulations are achieved.
All aircraft I believe have to demonstrate that they can land safely on runways when they are slippery for whatever reasons.
But they achieve the numbers by applying correct techniques which most of us are trying to avoid. They put it down on the correct area (not trying to show how clever we are with a smooth arrival); apply maximum retardation with reverse and brakes (so hell with passenger comfort lets stop it when in doubt). They then factor the numbers to allow an allowance for us not getting it right.
So where is the problem?
I suspect it is in our jaundiced view that we wish to show passengers how smooth our operation is - big deal 200 die as a result?
I relate all this as a pilot who found it very difficult to put the aircraft down firmly on suspected contaminated runways. You have been warned!