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Bump stops, like those used by Ford, are designed to have clearance so that the suspension can move freely through a certain range with less stiffness (for softer ride). It's only if the vehicle hits an unusually large bump that the bump stop would make contact to prevent the suspension from bottoming out in an extremely harsh manner. If not for bump stops, a large bump or pot hole could cause a metal-to-metal impact no one would want, or likely forget.
The role of bump stops are not the same as that of Sumo springs, so their effectiveness shouldn't be compared directly.
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