I think hindsight is a wonderful thing. This virus is novel (adjective. of a new and unusual kind; different from anything seen or known before), and even now they don't understand it. So it is OK to say, we need not have done this or that, but the real fact is no one really knows, even now.
I agree wholeheartedly on 20-20 vision after the fact, and certainly we could do with more cleanliness in the world, which we had imposed on us, (I have long remarked on how many people don't wash their hands after visiting toilets, so on a level that was a godsend), however with what we now know, should we not be changing our strategy, (aka lockdowns)?