I think an argument can be made to have this as a core plugin.
I thought I posted something about this on the forum, can’t seem to find it now…
Found it (https://forum.obsidian.md/t/fully-transclude-backlinks
/325/64?u=mabdallay) Although this is in relation to backlinks, my request for an outliner core plugin is the same — A more inclusive design for all! 