We're trying to standardize the use of tags on our site amongst writers/editors, and I'm trying to come up a list of tags they can choose from to tag posts with - and telling them to use no more than 10 (absolute maximum) per post. We are also in the process of migrating to a new CMS, and have 8 defined categories that will all have their own landing page within our "News" section.
TLDR:
Do blog tags have any impact on SEO anymore? Are they solely meant to help users find articles related on popular topics, or does creating a tag for a popular topic help to improve organic visibility?
Full Question:
With the tag standardization, I want to make sure we're creating the most useful and effective tags; and the UX/SEO sides of my brain are conflicted. To my understanding, creating a tag about a high volume topic in an industry helps establish the website's relevance to Google/other search engines about that topic and improves overall relevance; but the tag feed page (ex: http://freshome.com/tag/home-protection/) isn't really meant for organic search visibility. So my other question is, is it worth it to noindex the tag pages in the robots.txt? Will that affect any benefit to increased relevance for Google (if there is any)?
I'm interested to hear others' thoughts and suggestions.
Thanks in advance!