boney I'm not really sure what you were getting at with this
More money, longer holidays, kicking pupils out that won't make the grade, smaller class sizes, selecting students based on ability, little or no SEN.
However independent schools come in all flavours, not all are academically selective (I absolutely take the point that they are socially selective), some actually have excellent SEN provision, and some have class sizes not that different to state schools. My general point is that there are various features of the independent sector that obviously work, and I never see the state sector acknowledging this. Perhaps academies with more freedom might be able to be more open to these ideas.
And I think that academic selection is not all bad - not the 11+ model of yore, but perhaps at 14 where those who obviously get nothing out of the traditional school set up and never likely to "make the grade" (whatever that may be) and who are therefore more likely to be disruptive. These kids could get so much more from learning a trade or job skills and allow those with different skills to get in with their education. But we're going off piste......