Seconded. Somewhat related is: PDF pages should have their own section and priority in search a.k.a. allowing PDF documents to be created just as inline blocks without pages for each one.
We could boil it down to: Allow to create anonymous/inline PDFs or Whiteboards (which aren’t pages and have no name).
Or even more general: Blocks should be the central atomic management unit in Logseq.
For this it is probably needed to assign types to blocks (internal or external), like Whiteboard as block type, to make use of its specific features. Like opening the canvas for a whiteboard.
EDIT: I also would favor to completely ditch “Whiteboards” section in the left sidebar for this reason. It adds unnecessary friction between all entities in Logseq. Instead make everything uniform and allow to search Whiteboard via their block type. Or just auto-assign a tag #Whiteboard to it.