Obviously, searching through a zettelkasten is the most important tool to provide to consumers of a zettelkasten, but there are a few other tools that I think I would want myself to keep track of my interaction with it:
I recently had a frustrating experience with documentation that takes a graph model (Kubernetes web site) but doesn’t provide these sorts of navigational assistance tools. I felt like I was going in circles the entire time. If I had some consistent indicator of whether I had even been on that page, or even better, how much of that page I had read, I would have been able to process all of it much more quickly. I also would have had the intense FOMO from not knowing what I might have missed along the way.
If we are going to pursue this non-linear form of content consumption we must have a way to ensure the same level of reader confidence and clarity is maintained that exists in more linear outline forms today.
The good news is that the granular nature of zettels makes them incredible easy to track and mark providing well for any such system to be overlaid on top of them.