I must add my two cents to this thread
I feel that it is not just the DISPLAY of information in all manner of colorful animated illustrations that is needed, but the ability to INTERACT with these interfaces to explore the underlying data and change it.
Imagine the visual tools of https://explorabl.es and https://brilliant.org being available within your Coda docs, so that the data in your tables could be displayed in a way that allowed users to interact with the diagrams to edit the value in the tables! Mind-expanding stuff!
The existing Slider, Checkbox buttons, and Voting gadgets are just the TINIEST tip of that mountain.
Facilities like https://mermaid.live, https://draw.io and https://quickchart.io show how information can be rendered in ways that make it easier to understand, explore and see insights. But they are a ONE-WAY system with no visual interactivity.
Interactive tools such as https://figma.com and https://miro.com do have great interactivity, especially for tablet users with a pen, and they can be embedded into Coda, but they cannot interface at the data level with the Coda data model.
During a recent hackathon, I saw experiments with Coda that allowed users to interact with information visually on a whiteboard - and have those interactions reflected in the Coda data tables (it was only a mock-up, so not a feature to be expected soon) but it WAS a great example of the type of INTERACTIVE VISUALIZATION capability that I feel Coda would benefit from.
In fact, I would go so far as to say that THIS would be the kind of feature set that would catapult Coda to the front of the marketplace and place it way ahead of all other codeless platforms out there.
So if I only had ONE vote to cast among all the suggested features in this forum, my golden-buzzer / one-and-only vote, would go to THIS topic.
Max