I went into all this with a 6 & 9 yo.
Direct or indirect restrictions (e.g. swerving places where masks would be required) took away a significant chunk of regular childhood experiences. Particularly with DS2, he's grown up in that time, at Christmas he saw Santa for the first time in 3 years, but he's grown out of the innocent wonder years. Those kinds of opportunities can't be reclaimed, those years are gone. Being 7 was pretty much a write-off for him with the start and end both being at the extreme ends of restrictions in the spring.
I still find it hard to psych up and do things with them in the holidays. A lot of it is actually just them growing up, and a fair part due to having an autistic 12yo (who is also not moving on to the normal social independence) but where restrictions have been relevant is that some of that natural bridge from 6-9 and 9-12 was removed. The effort to push and get going in a world of zero external motivation has been exhausting. The effort of doing things like food shopping during mask mandates and playing roulette on face-covering panic attacks, or risking abuse for not wearing one (fortunately that didn't happen, but I'd go late at night to avoid people). The little things we'd do like going to a park to cheaply break the day up now has zero appeal after so, so many months of it being the only option, especially over the miserable winter of 2021. Maybe they'd be over that by now anyway, but there has been a seamless seague of it from the days of restrictions and their consequences.
It also wasn't socially healthy for DS1 to have had so much social isolation at that stage of life. While it didn't bother him in the way that it distressed DS2, it's not healthy for him and his development to always be in that state and he's had mixed messages; go to school, stay the fuck at home, go to school. Don't go if your classmate has the sniffles, you've been off ill but improve your attendance, and so many young people were screwed over as we said they would be again and again and again