Vast tracts of those two years of measures were not protecting the NHS. March/ April 2020, I won't argue, but all May-September did was stockpile exposure of new cases up for the usual pinch point over the winter. And repeat in 2021.
And since then people's health has declined because their immune systems haven't been used and "updated" or lack of access to diagnosis or routine treatment has aggravated conditions. Death rates are still above the 5 year average (inc Covid peaks) and higher rates non-Covid causes are consistently high.
School attendances have not recovered to pre-2020 levels. DS1's is his worst ever at 95% due to having 3 rounds of winter illness requiring multiple days of Sept-Jan with several more in between. He was ill every 3 weeks. It's normally a "bad year" for him if he misses a couple of days. That's aside from children struggling in many ways including being stuck for years on long waiting lists for developmental/ mental health assessments.
School wasn't closed... from home the DCs and I could hear the playground sounds of children including their classmates playing together while they spent nearly 5 months being prohibited from crossing the threshold. Ds2 was 7 and forgot how to play because there was no one his age to legally play with for so long. By the time he went back to school he'd forgotten who his classmates were and his keyworker friends had grown and matured in his absence. In the winter lockdown, he sobbed on my lap daily during the online lessons, taunted by the sight of half his class that the law banned him from meeting. It was worse than closed.
If it's so abhorent to facilitate a "two-tier" system of vulnerable people being facilitated to shield if they wish while others can live more freely, why did we basically impose it on children based on parental occupation? Children were the lowest risk age group, but by the winter lockdown couldn't even legally meet the exercise with another person exemption if they were over 5 due to the need to be supervised. Again, they were often hit by the Rule of 6 as it was easy to exceed with standard family sizes. With over-zealous policing and curtain twitching it took a lot of confidence to be willing to be seen to break the law in public.
In my youth groups, there's so much more separation anxiety and difficult behaviour than usual. The children coming in now are those that were around starting school age when their social development was interupted, plus the loss of learning experiences.