I recently meet a problem that needs to use 2 vaults at the same time. To be more specific, I keep all my reading notes in a cloud folder where i keep all my books, and all my writings in another. So my problem is, sometimes I need to quote something like a summary in my reading notes to my writing, I can only do it by copy&paste or a screenshot.
So my proposal is that we add an “import” feature like in Python or like the friend class in cpp, which allows us to quote things in another vault more easily.
i.e. link a file like [[friend/import_vault/file_i_want.md]].
Imports in an imported vault can be ingored, and I think just adding the quote feature in the imported vault is enough.