Before revision:  We show that even without considering the energy resources required for CSI acquisition, the gains from operating with CSI decrease quickly as the number of powered devices increases, while distributed CSI-free strategies become even more advantageous by widening the energy coverage region with high reliability.
After revision:  The benefits from combining DAS and EB, and from using average CSI whenever available, are numerically illustrated. The pros and cons of the state-of-the-art CSI-free strategies become even more advantageous by widening the energy coverage region with high reliability.