a) will be forever unknowable, although we can make some broad observations across various countries' responses to Covid and the overall outcome. EG: Australia has had strict lockdowns since March 2020, yet their cases are now spiking horribly (as I've heard so many times, with deaths lagging a few weeks). Where I live (Wales, UK) has had a mask mandate since September 2020. We were not allowed other people in our houses from March 2020 till mid-2021. Most places of entertainment have been closed around half the time, etc etc. Yet our observed outcome is objectively terrible.
All I can say is that my subjective experience has been dominated by the side-effects of Covid restrictions. I personally know only one person who has had anything more than relatively minor symptoms from Covid. I accept that my experience is probably biased in one direction, but I doubt there are comparatively many people whose life has been dominated by Covid itself.
b) is a contentious subject, and our inability to discuss it shows that we have become too detached from the reality of life and death as a society. Tell me - is it better that a young child has been correctly "isolated" in their room for many days, and told that it's necessary so they don't kill anyone with Covid, and grows up into a disturbed adult, or that an elderly person with several chronic health issues dies a year or so earlier than "expected"?
Death is not the worst thing.