Calibre already insists that destination folder for a library be empty. How does adding a subfolder make it better? I end up with a folder with exactly one thing in it, another folder. Of course, you might be suggesting that the containing folder be arbitrary, but then you run into other problems such as name collisions.
One consequence: it would lengthen the fixed part of the path thereby shortening the variable part, something that will make people unhappy.
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