Given the legal framework around striking, IMO it is very simple to explain the difference between strikes and taking time off for leisure.
Schools should not have lied to kids about needing to attend when sick. I have made this point to my school on numerous occasions and have always declined attendance awards.
Some absence is fine, some absence is not. Every child is individual. The fines for holidays are stupid, it is just gesture politics.
We don't do school holidays or time off for leisure - and frankly Wales went insane with the attendance when sick stuff - the Welsh government publishing leaflet that communicable diseases were fine to be in school with and getting told off by Doctors publicly was a particular low point.
So I don't disagree with most of your post - but I do think long absences with covid - and we had a lot with years beings sent home and additional closures, strikes (and for us today snow days) are having an effect on pupil and parent perceptions on attendance.
We do seem to be getting through with our kids and the message they get from us is they need to be proactive with their education- get on on-line sites and use workbooks and do extra - ask us for help etc. not sit back and rely on school.
However if parents as pro education as us are getting frustrated as school closure at drop of a hat and then school's attendance nagging and attitude with actual illness and appointments then I can't see good things for families where they are more ambivalent or have additional concerns and priorities.