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I was in the same situation that you are almost one year ago, and we decided to go with new blog posts for each tutorial.

One of the main reason was to target longtail keywords and we are doing quite good with that. And on some keywords we are getting the product page and alsot a blog post or two in the search result page so that is a plus because we have more chance of being clicked since we have more content.

Another reason was for social media and newsletter, we send out weekly newsletter so having new content on a regular basis was important for that also.

Hope this helps

If I add a lot a product/articles I just do a sitemap re-submit but if I only add one product or article I just wait till the bots crawl to that links. It usually takes a couple of day before it gets indexed. I never really used the fetch as google unless I made changes to the structure of the website.

Hope this helps.

One  of our most popular landing page is starting to be a little bit out dated, should I keep the old content and update with newer text or is it safe to completely replace the old content with the new content without losing our organic traffic on this page?