Meta Descriptions are really important. They have a direct effect on click-through-rates and call-to-action.Only if they are used by Google or Bing as descriptions in search results, which is not always the case. They are not used in ranking.
And this thread is not about meta description tags per se, but rather about duplicate tags vs. no tags.
Meta Descriptions are really important. They have a direct effect on click-through-rates and call-to-action. Consider a plumbing company's main page meta descriptions - you would like to have your phone number there because your customers might be in a position where they don't have the time to browse your website and need help ASAP (imagine your bathroom pipes just burst and you are panicking). In that case they might even not go to your website and call you right away.