Implement a scene graph (like many other engines) that allows building objects using a hierarchy of other objects.
"Rotation and scale of a group is applied to all child actors. Child actors always work in their own coordinate system, parent transformations are applied transparently." source: https://github.com/libgdx/libgdx/wiki/Scene2d
and ditch the clunky and unfriendly CONTAINERS + PIN.
We think this is a good idea. However we first want to implement the new C3 runtime. Even after that, it will take further consideration, as it sounds like it would have fairly deep architectural implications. So we are marking this as "Future consideration" until we can provide a firmer response.