You risk your mental health and the physical health that you do have.
It's like going back to feudal Britain, where the Head has almost total power. If the Head so chooses, with a few fawning SLT to back them up, they can make up anything they like about anyone - or just pile on the work and stress until their chosen target is broken and either capabilitied out or resigns. Or they can implement policies that harm learning and insist (with observations, book scrutinise etc) that they are followed, then have a go when results fall. Or just ask for the impossible and berate staff for not achieving this, year on year. Most schools do that one. And of course pay is performance related, so if you don't meet those impossible targets, you won't go up a grade!
Then there is being on your feet all day, carrying huge piles of books to mark, being bent over a desk marking all evening, every evening. If you are sick? Tough. Medicate up and come in.
I have met so many ex teachers since I left. Most had nightmares for 6 months or more after quitting. Some had PTSD, and many ex teachers now Home Educate their own children. That is telling.
Some schools are good. Yet they are dependent on that one Headteacher, who could leave, or become sick...