RSS is simply defined as Really Simple Syndication, XML based format for content distribution. Yes RSS Feed really support SEO.
RSS feeds supports SEO then; but now we can't assure anymore if its still worthy because its being abuse by some.
RSS is only used to syndicate your content to the web, Many of webmasters use RSS feed to scrap your content and post them on their site, they may keep backlink to your site also. It may help to grain some traffic, not exactly help full for onsite or offsite SEO, no relation with SEO, just usefull to bring traffic.
RSS mostly using autoblogs.. you will get backlinks from every posts they post.. and of cause it helps SEO.
RSS is mainly used for the sites that update their content very frequently foe exzmple news related sites.it is based in xml formet.user subscribes your feeds then they get a copy of your content via mail,this will boost the popularity of your site hense help seo
RSS benefits all parties that share the information. It is an automated way to share content over the internet and it has a SEO value
RSS feed means others can subscribe your article or news, this can give you traffic. And you can get benefit from this. It is a new method of SEO.