When I’m browsing around my KB, I often want to go up X levels.
If I’m at the top level, I have to switch keyboard shortcuts (from ctrl+\ to ctrl+;).
It also forces a bit of mental overhead to keep track of whether I’m at a top level rem or not, even when it’s irrelevant to what I’m trying to do (navigation)
Simply changing “Go to parent” to zoom out if at the top level and move cursor to the parent would be very intuitive.
P.S. - IMO the “Zoom out” shortcut could also be more useful (but still very intuitive) if it first jumped to the current doc root and on the next click zoomed out.