Thank you for the reply and further explanation.
I think the philosophy behind the Vault in Obsidian is that:
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the notes stored within the vault are mean to be logically connected.
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the notes stored in different vaults are mean to be not logically connected.
This is the fundamental rule, or working assumption of Obsidian.
By using vaults in vault(nested vaults) or by maintaining the files in vault via the file system, one can achieve something, looks like, beyond this working assumption, such as “hiding” the logical connections. However, all these methods are, actually, based on the very work assumption aforesaid.
And all these method have trade-offs, some may break the note system. For example, the problems of using Finder (file system tool) is discussed at: Using the Finder (or other file explorer) with Obsidian files? Problems?
IMHO, rather than dancing on the edge of the cliff, i mean, using some fancy tools but is unstable or even risky, I think we can have a review of our entire work flow, to figure out which part can be improved by the use of Obsidian. For those parts that violates the working assumption of Obsidian, the Obsidian may not be the best tool for them.
I know this sounds frustrating, especially for the people who had been struggling and looking for an ultimate tools for solving all problems on PKM for a long time. Obsidian is a very good tool, but it has limitation.
As the developers of Obsidian still sharpen it, we can expect some good features in the future. But right now, my suggestion is either upgrade the work flow to “adapt” Obsidian or use Obsidian only for what it is best for.