I sat wondering this today as I watched Ben (aged 9) reading Captain Underpants to Laura (aged 5). He read with such enthusiasm and invoked different personalities into his voice for each character that Laura was riveted and I could see from the expression on her face that she was enjoying the experience of being read too. I asked her what she liked about the story, she said what she liked best was the way Ben told the story.
For us, the emphasis is about the development of our children not the adherence to a certain curriculum. Don't get me wrong, we do use some curriculums some of the time. But for us a homeschool education is about learning from real life and creating life long learners.