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Rockfall resulting in chopped anchor report 25-Feb-2015 At 9:08:00 AM Dave_S

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The sliding-X with limiter knots still has ~~no redundancy between the limiter knots~~, and the limiter knots are also not redundant, as if one fails then the whole anchor fails, whereas when tying a sling like a cordelette, you would need to cut a minimum of two strands in the master knot in order to cause failure, so it is somewhat redundant.

Also, DMM drop tests suggest that when tied in Dyneema, a sliging X with limiter knots could fail in a FF1 fall (on a static tether, not on a climbing rope). They didn't exactly test the X with limiter knots, but the "overhand knots" configuration that they tested could be thought of as equivalent to one, except that in the X if one knot fails then the whole anchor fails.