I build with my 6 year old son, or should i say he builds, and I hunt down the parts for him. What I will say is:
1- I like the numbered bags. To build something like the Lego Creator Bike and Coffee shop that has over 1000 pieces, without numbered bags becomes a task. Just separating by color will take a good 30 minutes to do. Then finding the correct piece takes a bit to do as if you don't have a big enough space you end up with a pile of pieces. I usually use a smaller table for builds. With anything not numbered for 1,000+ piece builds, you gotta use a big table. So I appreciate the numbered bags.
2- Personally I am not crazy about the outlines in the pictures. I know that my wife is not great at the pictures, so it will help some one like her. But I think Lego is a learning toy. For my 6 year old, it teaches him problem solving skills. I think the outline on the instructions takes away from that learning. I know it will speed up the build process for him. But like everything else in life, it is the journey that is important, not only the destination. So I would prefer those not to be there. I think it takes away a lot from the experience.
At this point, with the technology that is available, I wouldn't mind if Lego had instructions without those red lines available for PDF download.
I could see the reason for using the red outlines though. It opens Lego to a whole new market of people like my wife.