ISTM, something like that for a bar exam would have a very limited shelf life in a practicing lawyer’s workflow. (E.g., I haven’t read International Shoe, Ships Peerless or Palsgraf since law school and have no reason to now.) As for what I use in my practice now? It’s called Westlaw.
I use Obsidian as a file manager for active cases only. It’s too much work to maintain on an ongoing basis, and most of my legal research is “one off.”
There was a time when I maintained a fairly comprehensive research database of interrelated issues and legal authorities. What I found was I hardly ever returned to it once I created the links. Which is a risk in the use of “second brain” type note applications like Obsidian, Notion, and OneNote. Basically, the amount of work required to maintain the tool far outpaces the amount of work saved in using the tool. While resources like Westlaw and Lexis are not cheap, they are very robust and save me enormous amounts of time and effort.
YMMV.