Fourth, book companies can only approximate what would be appropriate for the average learner. Book companies try to address the general public. But when you have children who can not identify with the experiences of the general public we have to select material from other sources or the teacher must provide vicarious experience to provide the necessary understanding of new concepts. Fifth, pure phonics is boring. We must engage higher order thinking skills from day one.
Interest is a key to learning.
Sixth, remember some children are ahead before they begin and visa versa. No two are alike. They all have different likes, dislikes, abilities, experiences, and emotional dispositions. They are all starting out at a different academic place, a different rate, and different experiences. One text will not suit all at the same time.