MutatingAdmissionPolicy KEP: Drop dependency on SSA unsetting fields #5182
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Per #5052 (comment) we're drooping the dependency on SSA unsetting fields. Since SSA is GA, we can still add such functionality in the feature (SSA unsetting fields support would need backward compatibility regardless).
The main consequence of this is that we MUST go to GA with JSON Patch support so that we have a patch mechanism that can unset fields. There had been discussions about possibly dropping it and only offering apply configurations. This is arguably not a bad thing since mutating admission webhooks return JSON Patch today for mutation, so including JSON Patch in the GA of MutatingAdmissionPolicy provides a more direct migration path from webhooks to policies.