I think this has better chance as to be done as a plugin than core feature.
I would like to see this in modified version where panes are laid out automatically around active pane, like the “local graph” in TheBrain (which on the other hand shows just icons and titles, not panes as desired here.)
Pinned panes could be dragged manually and would stay displayed on large screen workspace while remaining free space would get dynamically populated by panes/files related to active pane/file. Link could be dragged from “gate” of one pane and dropped into specific text location in another pane. Link-type could be selected during link creation and visualized by link-line color and relative pane position (up/down/on the side). Faint link-lines could continue into pane on text background to precise link-text location. Content in panes with long text would be visualized by Display vertical context in long scrollable document (RemNote-like auto-folding mode)