I think you'll fine that stereotypically 'good school' judged from just an academic sense tend to not be aware of such issues. There was an article a few months ago from the head of a secondary not too far from Michaela saying how KB is sending too many SEN kids and kids with complex issues to her and some of the other schools nearby, that they tell patents unofficially that actually if want something more pastoral or we can't cope with your child's needs but x school can. In her article she said that theres no massive difference between her and Michael, as in its not a special school or anything like that, but that KB doesn't want those kids bringing them down essentially, tends to be kids with mental health issues, disabilities etc. She said that it started a small number so she didn't mind, but now theres so many that its not fair to do that, she said some of them are incoming Y7's who they know have issues and then after their 'bootcamp' they try and pawn them off. Again another head a little bit further from them said something similar and how every school in area should help each other but not overwhelming some schools with pastoral, sen etc.
My old Sociology teacher actually had some time there as a trainee and she said if anything it taught her how not to be a good teacher, how to not be relational, and also that she didn't really have any choice or control of her teaching (yes she was a trainee but even more senior teachers had this, and they lacked autonomy, she said she thinks any longer and it would have stole her enjoyment out of teaching and also she knows her classes and should be able to adapt things for them), there's also lots of reports about how kids who report anxiety and mental health issues are treated again with the Harris Academy now being investigated by the LADO after years of reports, and students having major issues. I wouldn't be surprised if a similar thing happened with her, I could be wrong.
My cutting the slack with attendance I mean using the methods we know works with EBSA or students struggling. It's not about the students who are going on holiday for no reason. It's not fining or forcing them in, over time that just makes it more likely for them to leave completely as they associate school with more and more negative things. It might be a part-time timetable even if it's for longer than you may want, you go at the child's pace, it's allowing a child who struggles to ask for help, to stay in a sensory room, or with a staff member they trust when they tell you they just can't do x even if they don't say why. That builds trust, and supports them, school is not just about grades, there should always be a holistic approach, we should value creative subjects, and sports, and different methods of assesment (oracy, presentations, portfolios, and yes exams), also personal development, student leadership that actually contributes to the school, doing plays and music activities, trips which improve world values e.g religious places, museums, plays, citizenship and PSHE and RSE that doesn't just hit the basics and does a PowerPoint by death approach of one topic and pretends that's a good standard. These things are just as important as grades as should be treated as such. Hopefully if they get it right, with the new Ofsted grading of schools (or at least better) as they've indicted they'll be a lot more of the judgement based on inclusion, personal development and wellbeing and attendance (but not just the stats but approach and strategies for those with complex reasons impacting attendance, rather than just a punitive approach).