And turning the bullets back into to a board removes the formatting from the top node.
Even though the top node displays as H1 when viewing it in board layout (right pane, below), it shows as plain, small bullet text among its peer nodes (left pane)
I want to think of H1, H2, and H3 as text formatting like Bold and Linked text, not a layout type (like board, bullets, table). And I am happy to have a restriction like “For line formatting ease, H1, H2, H3 apply to all the text on that node.” But can we (should we) treat H1, H2, and H3 more like text formatting?