There’s beauty in node graphs like these, even if in this form it hasn’t much use value. This is my graph of the ~2.600 notes I keep in Obsidian after 9 months of daily use, as part of my personal knowledge management system.
The outer rim of islands is the reading and summarising in progress. Yellows and greens are notes and notions (around 50% of the total), red work related notes, blues are about organising and planning (day logs, weekly reviews, checklists, templates etc.).
For contrast the graph of the around 7.000 notes I exported from Evernote, which has no structure at all (except for one island of notes having numbered footnotes, which causes a connection between unrelated notes having links for the number  which also happens to be an existing note title).
When graphs are useful to me in practice is when I’m looking at local graphs of my notes, while writing. A local graph shows me the notes connected to the current note, at different degrees of separation. One degree I never use (those are the links appearing in the note itself), but two degrees (to which notes the linked notes in my note themselves link) is useful, as it allows associations and new connections.