I do wonder, if only the Turbo P-States are what cause the vulnerability. Is relying on Deep C-states for instance an alternative to get power savings? On my se

I do wonder, if only the Turbo P-States are what cause the vulnerability. Is relying on Deep C-states for instance an alternative to get power savings? On my server during idle, when cores enter C6, the power savings are at their maximum and no frequency scaling can match that. Why not just rely on that? (Ignoring the loss of turbo boost ofc)