It depends on a couple factors, seems to me. What was the purpose of the White Council? To further the purposes of Manwe in specific, and of the good of the Free Peoples in general - right?
Additionally, even powerful beings have a need for community. From Isengard to Rivendell Gandalf, Galadriel, and Elrond were near each other, and enjoyed each other's company. So whereas they no doubt could send thought over distances, they would just as likely choose to be near each other spatially.
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