Hello!
One thing I feel like is missing from most whiteboarding is a way to create branching information. This is primarily used in story telling but the concept could be useful in a variety of industries.
The main component of this is collapsible cards that expand in canvas to reveal more information and can then be collapsed again. The Main card would have basic information similar to the current cards however it would not be a task it would be more like a collapsible doc that can be expanded or collapsed vs needing to be clicked on to see information inside. This allows for details about a node to be included and hidden as needed. This should also include the ability to have rich text and images. While intended for branching stories, this could easily help add context to diagrams for any industry.