I think flobadob is just saying that a more targeted approach may have been sufficient. (Shielding of over 70s and those with heart, breathing, diabetes, dementia, test all care homes residents and staff weekly, maybe just stop large gatherings such as concerts, theatres, restrict use of public transport, social distancing for all in all shops, hairdressers only open for under 60s, maybe some stronger BAME guidance).
With hindsight that may be the conclusion.
I think Gromit's world figures need to be treated carefully. I do not believe that many countries know or are telling us their figures.
If we use Europe and US the excess deaths figures suggest around 1 in a 1000 people have died due in some way to Covid in the last 3 months. That seems a lot to me in 3 months. We certainly had to act