The problems we must deal with were created decades ago when we somehow ended up with a public system open to all - and a subsidised private system open to some, if they could pay. It's hard to think of a better way to create a social and academic apartheid framework of schools.
The schools that are partly resourced by fees inevitably harvest an advantaged enrolment; the schools that are free and open to all become socially and academically residualised. What we've always guessed but now know is that this system, almost regardless of teacher quality, makes it much harder to lift the achievement of kids at the bottom of the school league.
For decades we have been in denial, wrapping this arrangement up in endless and often shifting rationalisations; it's variously been about choice, competition, quality, entitlement. Choice is considered most important, despite the fact that choice of schools is really only available to those with money.
For this very reason we find that choice sits at one end of a continuum - but down the other end lies equity. This dilemma is now very important because improving equity of student outcomes can only happen if we challenge the right of some to unrestricted choice.