I love using the mapped data (beta) feature so far. I think this is the way to go for all components.
I was wondering - could Containers have mapped data? That way you can make all the children data relative to {{thisContainer}} data instead of transformer data? I think this could make data better organized and contained within containers
With ListViews, you could just wrap iterators around the mapped data itself — it's definitely less convenient than using the global {{ i }} but it opens up so many possibilities for nested loops, nested listviews etc.