Perhaps the "spoon-feeding" refers to the systematic help given to pass exams well? Perhaps that could be called "good teaching" at one level. After all, it fulfills government targets, doesn't it?
In itself, exam-passing (however that is achieved) is a pretty good organisational technique to learn for later life, (getting the work done to an excellent standard in any job), but sad if that's at expense of the creative, philosphical, exploratory side of education. All the evidence I've seen in the indie sector has very much been towards developing thinking skills and aiming high - and not simply being handed the answers.
Idealistically, I think education should teach children a, the wherewithall to earn a living using their particular individual abilites and interests, but b. at a deeper, heart level, to enable them to discover the person they truly are. At that point of self-discovery, I think exam and career choices become more obvious and the motivation to succeed comes more easily. IMO the independent sector often focusses and succeeds in doing this to a better extent than the state sector.
The OP talks about "average" children doing well enough to get to RG unis. Well, roll on the day when every child clever, average or otherwise, is given an environment (state or indie) that nurtures them so they know how to leave education and live life in a fulfilling way. Schools aren't the only influence, but our children spend an awful lot of hours there.
My dd has just had her induction afternoon at an indie school where her Year Head talked about how our dds well-being was her "number one priority". Contrast that with the "welcome" letter from the state Grammar (in the top 30 in the country for exams results) my daughter received when she got a place this year. The letter began, "Dear new year 7 pupil". They couldn't even address the letter to her by name. Small points, but this highlights the difference in the ethos of the two sectors.
If treating children with care and respect gets them better qualifications and better uni places then that's the best practice the state sector should try to emulate.
As a parent I had a choice to make. Yes, I'm grateful I can pay to give dd advantages toward her making a success of her life.