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Vifs aren't attached to ports or portgroups they are attached to nodes, attaching them to ports/portgroups is a implementation detail of the neutron/flat network interfaces.
In some scenarios/on certain hardware a node doesn't have any ports/portgroups until the network interface attaches the networks as they are created on the BMC based on the VIFs attached, or in certain implementations a physical port in Ironic might have multiple vifs attached to it to represent a virtual interface card.
Both these situations break the assumption that one VIF attaches to one Port or Portgroup, so assuming this in the API will reduce the flexibility designed into the API to begin with.