In general, I think it's good to have RSS feeds for a site. It's a good way of reaching new viewers, who might only come across your content in a reader or a syndicated version. Also, lots of social platforms have an option for including an RSS feed - so if you interact on the social platform - people you are interacting with would be able to see some of the most recent content from your site.
Google doesn't count RSS feeds as duplicate content, and is generally smart enough to figure out the original source of the content if it was republished in part somewhere.
