"DRS" rules are rules managed by the vCenter. Without vCenter no management of DRS rules
For the HA indeed, it is set up by the vCenter but as information is written on each ESXi, even in the event of loss of the vCenter, the device remains available.
I come back to this discussion. Because I read an article about vCLS service from VMWare 7.0 U1.
This service allows you to disconnect DRS and HA services from vCenter.
Sorry for the inaccuracy of my previous answer, but we are still on version 6.7.