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Updating metadata and covers via Polish book will only mimic -- for the library copy -- what send-to-device/save-to-disk does on the exported copy.
The exception is if a book has broken metadata and does not specify a cover. Polish book will create a new cover if necessary, but send-to-device/save-to-disk only updates a pre-existing cover. This is a one-time fix!
Ordinarily, the only reason to update the metadata on the in-library copy, is if you will be using calibre2opds or Dropbox (or both) to download books to your device.
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