The irony is not lost on me that the most vociferous complainants on this thread are the very same people who would issue forth on the inequities of the private school system, with its ingrained privilege.
Whilst I would be with them on the broader sociological aspects of that argument, I do have relatives who were privately educated and the ones at the most prestigious schools had very long working days, and no pîssing about in the name of "testing boundaries as a part of growing up" was included in their day. As a consequence, nor were their lessons disrupted by others.
My nephews had to work extremely hard to pass the entrance exams for the City of London school. Whilst attendance at that school may confer unearned advantages upon them, that attendance was earned. One nephew is now mucking about in Spain teaching TEFL, under the pretence that he is going to be an actor, and the other one works slavishly hard as an undergraduate architect.
What was it, I wonder, that conferred upon him this work ethic, and just how much better could he have done in life had he been allowed to waste his and his teachers time in school arguing the toss over absolutely-fûcking-everything?