In this release you cannot use AES to clear the Rule cache.
SMA tool might be depricated in one of the Pega 7.x version and that's the reason we have started providing the features available in SMA in recent versions(Pega 7.4) via. Resources > Pega API REST resources and Designer Studio > System > Operations > *
AES 73 has a subset of SMA features but does not have clear cache.
SMA is shipped with Pega 74 and I think will be available for 81 but will not be enhanced and will in time be completely replaced by Admin Studio. Admin Studio and REST API are supposed to provide complete SMA-replacement capability in 81
PDC does not and will not have any features to take action on monitored systems. PDC does not connect in to monitored systems - monitored systems send PDC data. We are enhancing the 'PegaAESREmote' agents that run on monitored system to send PDC more information about system state (agent status, listener status, queue state, cache state, etc) and will be releasing those new rules as hotfixes for 73 and 74, but that enhances the data captured, displayed and interpreted by PDC; it will not give PDC itself any abilities to take action on a system.