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If vcenter isn't up then you can't do anything regardless if vcls vms are moving, vcha is an option but is a overkill. The reason you don't want to keep it on an ephemeral port group because that stresses vcenter and the esxi hosts and you lose some features. Since its no impactful in most cases to just add the extra portgroup, thats usually the correct option.
Performance
Every operation, including add-host and virtual machine power operation, is slower comparatively because ports are created/destroyed in the operation code path. Virtual machine operations are far more frequent than add-host or switch-operations, so ephemeral ports are more demanding in general.
Non-persistent "ephemeral" ports
Non-persistent (that is, "ephemeral") ports port-level permissions and controls are lost across power cycles, so no historical context is saved."