I agree OliPolly, thumbwhich, sakura
And I think what she was getting at is that self-discipline, hard work and commitment will ultimatley bring self-confidence, resilience and fullfillment becauase it makes you do your best and teaches you that even if you start off not being very good at something you realise that you can be good at it and achieve what you want through hard work and not giving up.
And that most children need to be taught this and won't naturally be self-disciplined enough to practice piano or do homework etc - well not to the very best of their ability anyway.
she said in an interview about her parenting philosphy:
"At its best I think it's not about achievement, but about trying to help your child be the best they can be and it's usually more than they think. It's saying 'I believe in you so much that I know you can be excellent, and I'm going to sacrifice everything and be in the trenches with you and I don't care if you hate me while you're a kid and I'm just not going to let you give up.' That's, I think, a positive message"
Although she does acknowledge that other forms of parenting can bring the results she values and cites her own husband as an example who had liberal western parenting but is 'successful' . (ie harvard grad, yale prof, best selling novelst apparantly). maybe they just feel its too risky to go that way with their own kids!