But what is being advocated is the complete abolishment of all restrictions so that we can 'live freely'. Sweden tried that and abandoned it. Taiwan and Singapore had that to some degree but have also introduced lockdowns.
Will complete freedom allow all those milestones you mention in your post to happen? The student can either miss attending school because of a lockdown, or they can miss school because they are sick, or their teacher is sick, and so on. My cousin is a teacher in their early 40s and got very sick with covid. The students still had disruption for over a month while their teacher was sick, and then in recovery.
We might not be able to hug mum on mother's day, but if mum is in isolation (shielded) or in hospital, that hug might still not happen. Isn't it better to know mum is alive and safe? And you can give her a hug the week after mother's day than not at all?
The argument is that if we have complete freedom all businesses will be open and thriving. Will that actually be the case when our daily cases are in their thousands? As was shown in Victoria, even if restrictions are lifted, it's not a guarantee that customers will return. People have not embraced returning to Melbourne's CBD even when allowed to do so.