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The only time to use a Robots Meta Tag is if you want to restrict either with nofollow or noindex or both. Otherwise, there is no point in using it, because the default is follow, index.
The Googlebot meta tag is only recognized by Google and offers a chance to give special instructions to Google. I would have to research the additional options this tag offers in addition to nofollow, noindex, but unless you have a need for special handling by Google, there is no need to have it.
Sounds like your Robots.txt has been doing the job just fine.
I might add, speaking of Google, I have seen Google use the text of my Description tag verbatim on several occasions to place a description in my index listing. It has to fit in with the page content, of course, and the search terms used relative to page content. And this is on pages that contain few pictures or other non-textual content.
Larry
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