Automatically revealing (and hiding what has been revealed prior) in the Binder would completely change it from the tool it is right now into something else. That is perhaps where the divide is between those requesting it and those saying it would be annoying. The binder is designed to drive the editor, not the other way around. It is a top-end organisational tool and working space. The behaviour that is being proposed here would convert the binder from that sort of tool, into some kind of auxiliary feedback device like the Explorer sidebar in Windows, that just jumps around showing you whatever you clicked on—but is in itself because of that, somewhat useless as a work space because it is not persistent and only nominally drives the right side. Hence, any friction toward making that sort of change. You’re really asking for some of the core management features of Scrivener to be converted into a completely different sort of program.
To the comment asking for a document navigator: Try the View/Go To/ menu or the analogous in the header icon menu. This menu will automatically turn into a document navigator when in a Scrivenings session, from its normal role of providing a single launch-pad to anywhere in the project. Note this navigation/information tool shows you hierarchy and current position with a checkmark.