[NAME] WSMAN will be "removed" in iDRAC10/17th Generation. You will not be able to use WSMAN and WMI. DCIM view classes will not be supported. There are Redfish equivalent properties in the OEM sections as documented in the  mapping whitepaper that need to be used. iDRAC service module also will be migrating to use Redfish  - [URL] 
For system inventory, I currently use WSMAN to the idrac to retrieve DCIM view information. These DCIM class are examples: DCIM_MemoryView, DellDCIM_NICView, DellDCIM_PowerSupplyView, DellDCIM_PhysicalDiskView. I do not use WSMAN for much more than inventory of the DCIM view classes. According to idrac release notes, WSMan access to the idrac is deprecated in favor of Redfish. The iSM agent however replicates these same DCIM classes from the idrac to the Windows OS at WMI namespace root/cimv2/dcim. I would like to know the roadmap for the DCIM classes. WSMAN shows as deprecated but it seems iSM DCIM sync to the OS is alive and supported. I found [URL] which helps a little but I would really like the DCIM class format and structure to persist into the future.
idrac DCIM roadmap