Knowledge graph
For me, the Graph View was the gateway drug to Obsidian. Even though I don't us it much, there's something captivating about seeing my whole knowledge universe laid out.
But there's something lacking in the Graph View. Obsidian is not the only place where my knowledge resides. I have more than one Vault, for different domains of my knowledge. I've become a very active user of Readwise and Reader. I built my own Bible app (https://scripture-study.vercel.app) and I'm planning to add support for notes there. And there other places like my blog (https://collectednotes.com/gillchristian), this Stream, Twitter (I'm not calling it X yet), and others.
Being able to visualize this whole universe, and how different elements connect to each other would be the next level of the Graph View.