Well from what I understand your tags should match your titles, so in a way yes. Obviously you can;t put your entire title in as you have a limit of 20 characters but I think it should be done in clumps, unless its changed again.
Not tags -- keywords and keyword phrases. Titles are important for search engines outside of Etsy. Tags are just for Etsy. Titles are supposed to make sense in the language in which they are written, not be a long mess of keyword soup.