I can only speak for primary but yes, it is relentless. For both children and staff.
The academic expectations (based on some very dodgy, and dated, research), the levels of violence (for whatever reason), and the endless, endless events and requests, which I know drive parents up the wall.
I think parents and school staff have been the typical ‘boiling frogs’ for so long that it’s hard to see that these expectations, in any other work setting, would result in mass industrial action. And so we have a teacher sickness and retention crisis and children who are, basically, going on strike! You’d think someone, somewhere, would have put two and two together.
So after that rant (sorry), I wonder if you have considered online schools? I don’t know what the cost is, but if your child is motivated to learn at home, maybe with the odd bit of extra tutoring, it might be worth looking at.
You sound like a brilliant parent btw.