@Reindeersnooker
You have raised a number of points so taking them individually:
"No one can tell us what life would have been like if we hadn't quarantined but I don't think the states in the US that rarely bothered have been a great example of what can happen."
This is an important point that this is all subjective opinion- no one can unequivocally state what would have happened had there been no / shorter / fewer or even longer or stricter lockdowns because there was lockdowns.
Regarding your point about US States that had less restrictive measures this is factually incorrect:
nypost.com/2022/04/11/ny-handled-covid-19-lockdown-poorly-florida-among-best-study/amp/
www.politifact.com/factchecks/2020/dec/02/ron-desantis/florida-doing-better-covid-19-locked-down-states/
"Presumably you realise that outcomes across the board would also have been poor if numbers of COVID patients had been exponentially higher?
I genuinely can't fathom what you think would have happened to these NHS waiting times in that scenario."
Clearly if the number of Covid patients was exponentially higher then the corresponding death rates would also have been higher but there is no way of knowing if the number of Covid patients would have been exponentially higher because there were lockdowns or equally exponentially lower if the lockdowns were stricter / longer. It's all subjective opinion.
As for the NHS equally there is no way of knowing what would have happened if Covid cases were lower or higher and whether they would or would not have weathered the storm.
"Or is there a caveat that COVID patients would have been at the back of the queue in this scenario and anyone who died of it wasn't fit enough to survive? Because that's reprehensible and we could - but won't! - say the same thing about any illness. "
But that is effectively what has and is happening now. Just taking cancer as an example screenings and treatments were delayed / post/ put to the back of the queue during the restrictions. We are now seeing the fallout from this and other illnesses through higher excess deaths.
"Believe it or not, the research on children's mental health during the pandemic is mixed- some children benefited mentally from the break. "
Whilst a small minority of children's mental health may have benefited from the restrictions, it is my opinion from what I witnessed that the vast majority of children's mental health was adversely impacted by the restrictions. I would be grateful for any links you have that support your view.
"The actual loss of learning time was not as great as is being suggested-around one and a half terms - and children would also have been affected by losing more teachers to COVID and long COVID. "
Again it is my opinion from what I have witnessed that the loss of learning particularly in younger children and in GCSE/ A level years was very significant. As for how many teachers would have died / long Covid without the restrictions is again a subjective opinion as is how many teachers could have been saved is schools were for example closed for longer.