The change was sudden, but the fundamental reason for the change has been part of the plan since last November when the first vaccine got approval. The plan has always been that we get enough people vaccinated to drive cases down and then we relax mitigation until all restrictions are gone. We’re almost there. The CDC change on masks and distancing for fully vaccinated people was based on the downward trajectory of cases and the total number of people vaccinated. We can debate what the right level of each should have been to make such a change but it was the CDCs call and they made it based on science and statistics and not just a random change.Well... the reason you were right was because the CDC and Biden reversed what they had said about masks overnight.