Better is the worst enemy of good. Please suggest a different metric then. One that can be measured easily and will do about as well as the biased infected numb

Better is the worst enemy of good. Please suggest a different metric then. One that can be measured easily and will do about as well as the biased infected numbers or one which will do better than the biased infected numbers at a similar effort. There is little control theoretic relevance of the Dunkelziffer smoothly varying between 2 and 6 as long as that doesn't make the controller overlook a wave (it doesn't). The sign of the policy should still be the same and if measures don't work, harder measures are imposed means we basically got a PI(D) controller and can achieve stationary solutions even if the Dunkelziffer changes smoothly.