I’ve seen lots of polarisation in some responses with no nuance whatsoever.
Yes, that's the trouble with threads like these, they end up a polarised bunfight. I think the split in responses indicates that the truth is somewhere in the middle and there's a balance to be had.
I think my kids' secondary gets a really good balance. It's just a normal big state comp with a mixed catchment, so not perfect of course. But there's no silly rules about getting detention for the tiniest thing. Kids can have their hair coloured, wear nail polish, wear small earrings (except for PE).
But they do crack down on some things. There are sanctions for not having your pen or lanyard. This isn't really about the kids who forget once, it's about the kids who can't be arsed to bring their lanyard or a pen, ever.
Toilets are really tricky as well. Sometimes my DD has to queue all break if she wants to go. But they can't just let kids go when they like or there'd be a significant minority of kids skiving every lesson or vandalising the loos. My DD understands that although it's a pain, it's a tricky one for the school.
I don't know what I think about the ultra strict schools like Michaela. I guess as others have said, they're brilliant for some kids but would be damaging for others.