People have much higher expectations than ever before. In contrast to some previous posters I think the standards in school have never been better.
When I started primary in 1993, we had one computer in the whole school, one textbook between 3-5 kids in some subjects and no school library. Oh and my school was burnt down due to arson from a child at the school!
By year 6 6/30 kids could still barely read and I could barely write.
Meanwhile in my kids' primary school they have a well stocked, large library, the quality of the work on the walls is incredible, each class has a teaching assistant in the lower years and, as a parent, the availability of school based afterschool/breakfast clubs is amazing, and just didn't exist when I was a kid. Almost all the Year 2s in my son's class are free readers, let alone the Year 6s.
Yet despite all this, the WhatsApp groups are still full of complaints, the behaviour is policy is too mean, the kids watched 5 minutes of numberblocks, not enough screens, too many screens, why was my child in this playground etc. etc. I've decided to defend the school on every occasion, even when I actually disagree - as I continually point out to other parents, even if you are right on the merits, the ongoing impact on the school of complaints is really negative and we risk driving away good teachers.
I'd rather put up with some screen time and keep my children's fantastic teachers.