ooo nice post! My recent post is pretty similar to your suggestion, thank you for calling that out: Graph View - consecutively click on notes and tags to create a storyline (e.g. for standup comedy routine)
Sorry I was unable to find yours earlier or I would have added my comments to your post.
I definitely agree that having a way to develop a fixed connection (or saveable connection) between various notes and tags through the graph view is the way to make it a valuable tool.