1. I agree. All books have some parts or sections which might be useless for you as a teacher; topics may not be interesting for your learners. As a teacher you should use the book as a guide but you should always complement it with your own materials.
2. I agree. Topics can be quite general, for instance: animals, games, colours, etc. As long as they are suitable for children. Pictures are a must when working with Yl's.
3. I agree. Teacher should create their own materials and store them since they can be useful in the future.
4. I agree. This happens in most schools.
5. I agree. This kind of books are usually thought to teach in an inductive way, which, as we know, is a much better way to teach.
6. I agree. I think for young learners it is not suitable to include an answer key.
7. I disagree. In international House we use coursebooks, but we also suplement them by adding our own materials.