Having the ability to rename clusters and datastores will improve manageability when working with multiple support teams, especially when the vCenter names aren't exactly "user-friendly" names. With having mulitple vCenters linked, all SDDC Resources (Clusters, Compute, Datastores etc.) are named the same.
Even worse, in some tools like vRNI you will have two datacenters with the same name. How can you search on them, or search on flows by datacenter, without getting things very complicated ?
Same situation with cluster names...
With having mulitple vCenters linked, all SDDC Resources (Clusters, Compute, Datastores etc.) are named the same.