This can be super useful. There could be a buton for it as well so it is not just something you would see when you open Joplin.
For instance
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It can show todos/tasks are waiting to be done, ones that are done.
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Note taking related action buttons.
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It can list most recenly added pages from all subnotebooks
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Sync status
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Most recent media files
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Other notebooks related statistics
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Some functional buttons to add/create more complex (like in macro fashion) todos, notes etc Like functioning calender view that user can click on a date to add a new todo for that day.
I hope the devs consider it.