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There is as of one of the later 7 versions (7.57? 7.58?) a "Modified" column that, I believe, shows the date the book metadata was last modified. This is not the Date column, which shows the date the book was added - the new(ish) column is called Modified. I don't think it's visible by default - I think you have to go into your Toolbar (Preferences/Toolbar) and check it to make it visible, or right click on your column headers and click to show this column.
To your larger point: I understand the desire for this. It's something I've occasionally wished for as well - plus device-specific info, like the specific format of the books on my device, or whatever - but my understanding has always been - and I'm not sure where I inferred this; must have been from reading some post somewhere along the way - that it would be laborious to implement as calibre now stands, and because it is possible to get much of the way there by using the Library view and filtering out the items not on the device, I don't think there's too much demand. I am by no means and in no way an expert, however, so don't take this as definitive!
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