Containers are the only object type that cannot be placed inside a container. QlikView offered this. If Sense could have the same capability it might help some users adapt their QV dashboards into Sense ?
Thank you for your feedback on ways to improve our product. While this is something we understand would be useful, it's not on the short-term roadmap. Please continue to show your support for this idea.
Fyi nested containers can become complex quickly and was a handful to support to it mildly.