can I suggest the most impactful change on navigation is one you have already created?
the media page side bar that shows the project entity schema laid out as a clear folder hierarchy is what should be implemented everywhere - This is how almost everyone on the project thinks of the project schema mentally and it acts essentially as a way to quickly filter the page results to any specific ‘leaf’ in the tree and anything below - which 99% of the time is what you are trying to accomplish via ‘navigation’ - take me to this shot or this asset, or show these shots under this sequence, etc
I like the media page a lot - IMO it was the right way to develop the rest of the application but years later it still feels alien to the rest of the UI, but it’s much simpler and easier to look at.
This is similar to how ftrack does navigation - it’s very much based around a similar tree view, but it works and it makes the navigation experience so much nicer and consistent compared to SG’s clunky page view paradigm
screenshot for clarity: