He stated that the goal is "greater understanding," and then he just (in all honesty) states that the nice graphical topology represents my learning journey and keeps me motivated.
That is exactly the problem: motivation and a history of learning do not always lead to "greater understanding." On the contrary, I find that our 'notes' are often transient while our internal understanding morphs subtly yet swiftly (especially when learning something new).
That is why I think 'organic linking' works better for very large AND more definitive content. Wikipedia is the best example.
For personal use, I prefer more structure. The outliner/database combo (like logseq) is the best tool for that.
And Frankly as long as I can easily download my data in a readable format, I'm OK with any tool. It does not have to be built as plain text files.
But I do like Obsidian :)