In Roam, it seems to me that one of the most powerful features is being able to add basically anything to the sidebar which you can then reference, drag in, etc… while composing a note, which can then be cleared out when you are done with it.
Obsidian has the great ability to open many panes, but screen real estate quickly runs out, even with the collapsible sidebar. Moreover, what is desired is to have a relevant segment of the notes put into the sidebar, not a full pane of the entire note. I don’t know what limitations markdown imposes, but something would be better than nothing.
I’m sure many other people could flesh this idea out better than I have, but hopefully at least some version of this is do-able.
I have also created a pared-down version of this request here: Create a “Working”/Temporary Starred Files List