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The situation here has changed. In order to get good SBE performance on a whole bunch of workloads we need the SBE plan cache enabled. But we also need the "applyClassicMatcher" work from SERVER-66814 in order to get good SBE performance. This poses a problem, because the "applyClassicMatcher" behavior cannot work with the SBE plan cache, and is inhibited when featureFlagSbePlanCache is enabled.
The SBE performance project will have to untie this gordian knot by fixing SBE native matching performance and deleting "applyClassicMatcher". In the process, the SBE performance project will also enable featureFlagSbeFull by default. For this reason, it makes sense to delete featureFlagSbePlanCache and consolidate it with featureFlagSbeFull. That work is planned under related ticket SERVER-61314. Resolving this ticket as "Gone Away".
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