Depends on your point of view. I have placed a poll & thread asking for PH test kit recommendations & I have no way of know all the credible options available.
So if Joe blow says he uses XYZ, he could add it to the poll choice thus negating the need for thread posts saying "me too". It's quite a common function in open polls these days whereas closed polls have more 'political' uses, narrowing choices to those the poster wants to hear about and limiting the discussion.