If I want to build a dashboard with multiple widgets on the screen, my first step would be to look for a layout tool. Which allows me to handle how the screen is divided into multiple areas and offers an interative interface so I can open, move, resize and close those areas.
I would not want a bundle that combines the layout tool with charts and forms and whatnot.
For example, if I want an area to be used for an interactive chart, I would want to build that with whatever solution I like best. Personally I already use Plotly for many things, so I would go with that.