IEnumConnections not implemented - latest SDK still buggy|Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

When OPC client tried calling a connection point EnumConnections(), returned HRESULT shows no such an interface. I checked source code in the latest SDK and COpcConnectionPoint doesn't implement IEnumConnections at all. To make it happen, there should be a separate class to implement all interfaces defined by IEnumConnections. It is not that difficult for me to implement this feature, but I prefer seeing action from OPC. In my early post I found IOPCShutdown not implemented either, now it is another one. Why is current SDK so buggy? Although it isn't a security related issue, basic feature is still missing. Why can't OPC release a new version to fix these issues? Thanks!